diff --git a/Marlin/Makefile b/Marlin/Makefile
index cb4d75504..349574c87 100644
--- a/Marlin/Makefile
+++ b/Marlin/Makefile
@@ -510,6 +510,7 @@ else ifeq ($(HARDWARE_VARIANT), archim)
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/cores/arduino/USB
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/libraries/Wire/src
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/libraries/SPI/src
+  VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/libraries/U8glib/src/clib
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/variants/archim
   LDSCRIPT = $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/variants/archim/linker_scripts/gcc/flash.ld
   LDLIBS   = $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/variants/archim/libsam_sam3x8e_gcc_rel.a
@@ -611,6 +612,10 @@ else ifeq ($(HARDWARE_VARIANT), archim)
   CDEFS      += -DARDUINO_SAM_ARCHIM -DARDUINO_ARCH_SAM -D__SAM3X8E__ -DUSB_VID=0x27b1 -DUSB_PID=0x0001 -DUSBCON '-DUSB_MANUFACTURER="UltiMachine"' '-DUSB_PRODUCT="Archim"'
   LIB_CXXSRC += variant.cpp IPAddress.cpp Reset.cpp RingBuffer.cpp Stream.cpp UARTClass.cpp  USARTClass.cpp abi.cpp new.cpp watchdog.cpp CDC.cpp PluggableUSB.cpp  USBCore.cpp
   LIB_SRC    += cortex_handlers.c iar_calls_sam3.c syscalls_sam3.c dtostrf.c itoa.c
+
+  ifeq ($(U8GLIB), 1)
+    LIB_SRC += u8g_com_api.c u8g_pb32h1.c
+  endif
 endif
 
 # Add all the source directories as include directories too
diff --git a/Marlin/src/core/macros.h b/Marlin/src/core/macros.h
index 945e983e9..11604f8c1 100644
--- a/Marlin/src/core/macros.h
+++ b/Marlin/src/core/macros.h
@@ -196,7 +196,7 @@
 #define MMM_TO_MMS(MM_M) ((MM_M)/60.0f)
 #define MMS_TO_MMM(MM_S) ((MM_S)*60.0f)
 
-#define NOOP do{} while(0)
+#define NOOP (0)
 
 #define CEILING(x,y) (((x) + (y) - 1) / (y))
 
diff --git a/Marlin/src/core/serial.cpp b/Marlin/src/core/serial.cpp
index d55e27015..e43747b66 100644
--- a/Marlin/src/core/serial.cpp
+++ b/Marlin/src/core/serial.cpp
@@ -25,8 +25,8 @@
 
 uint8_t marlin_debug_flags = MARLIN_DEBUG_NONE;
 
-const char errormagic[] PROGMEM = "Error:";
-const char echomagic[]  PROGMEM = "echo:";
+static const char errormagic[] PROGMEM = "Error:";
+static const char echomagic[]  PROGMEM = "echo:";
 
 #if NUM_SERIAL > 1
   void serialprintPGM_P(const int8_t p, const char * str) {
diff --git a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
index 9decaeafb..3e03dd0fd 100644
--- a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
+++ b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
@@ -917,7 +917,7 @@
     }
 
     inline void set_message_with_feedback(PGM_P const msg_P) {
-      ui.setstatusPGM(msg_P);
+      ui.set_status_P(msg_P);
       ui.quick_feedback();
     }
 
diff --git a/Marlin/src/feature/pause.cpp b/Marlin/src/feature/pause.cpp
index 04d7682df..0736bfebd 100644
--- a/Marlin/src/feature/pause.cpp
+++ b/Marlin/src/feature/pause.cpp
@@ -399,14 +399,19 @@ bool pause_print(const float &retract, const point_t &park_point, const float &u
 }
 
 /**
+ * For Paused Print:
+ * - Show "Press button (or M108) to resume"
+ *
+ * For Filament Change:
  * - Show "Insert filament and press button to continue"
+ *
  * - Wait for a click before returning
- * - Heaters can time out, reheated before accepting a click
+ * - Heaters can time out and must reheat before continuing
  *
  * Used by M125 and M600
  */
 
-#if HAS_LCD_MENU && ENABLED(EMERGENCY_PARSER)
+#if (HAS_LCD_MENU || ENABLED(EXTENSIBLE_UI)) && ENABLED(EMERGENCY_PARSER)
   #define _PMSG(L) L
 #elif ENABLED(EMERGENCY_PARSER)
   #define _PMSG(L) L##_M108
diff --git a/Marlin/src/gcode/bedlevel/G26.cpp b/Marlin/src/gcode/bedlevel/G26.cpp
index 64040cf90..65a777d41 100644
--- a/Marlin/src/gcode/bedlevel/G26.cpp
+++ b/Marlin/src/gcode/bedlevel/G26.cpp
@@ -164,7 +164,7 @@ int8_t g26_prime_flag;
    */
   bool user_canceled() {
     if (!ui.button_pressed()) return false; // Return if the button isn't pressed
-    ui.setstatusPGM(PSTR("Mesh Validation Stopped."), 99);
+    ui.set_status_P(PSTR("Mesh Validation Stopped."), 99);
     #if HAS_LCD_MENU
       ui.quick_feedback();
     #endif
@@ -414,7 +414,7 @@ inline bool turn_on_heaters() {
 
     if (g26_bed_temp > 25) {
       #if ENABLED(ULTRA_LCD)
-        ui.setstatusPGM(PSTR("G26 Heating Bed."), 99);
+        ui.set_status_P(PSTR("G26 Heating Bed."), 99);
         ui.quick_feedback();
         #if HAS_LCD_MENU
           ui.capture();
@@ -435,7 +435,7 @@ inline bool turn_on_heaters() {
 
   // Start heating the active nozzle
   #if ENABLED(ULTRA_LCD)
-    ui.setstatusPGM(PSTR("G26 Heating Nozzle."), 99);
+    ui.set_status_P(PSTR("G26 Heating Nozzle."), 99);
     ui.quick_feedback();
   #endif
   thermalManager.setTargetHotend(g26_hotend_temp, active_extruder);
@@ -469,7 +469,7 @@ inline bool prime_nozzle() {
     if (g26_prime_flag == -1) {  // The user wants to control how much filament gets purged
 
       ui.capture();
-      ui.setstatusPGM(PSTR("User-Controlled Prime"), 99);
+      ui.set_status_P(PSTR("User-Controlled Prime"), 99);
       ui.chirp();
 
       set_destination_from_current();
@@ -493,7 +493,7 @@ inline bool prime_nozzle() {
 
       ui.wait_for_release();
 
-      ui.setstatusPGM(PSTR("Done Priming"), 99);
+      ui.set_status_P(PSTR("Done Priming"), 99);
       ui.quick_feedback();
       ui.release();
     }
@@ -501,7 +501,7 @@ inline bool prime_nozzle() {
   #endif
   {
     #if ENABLED(ULTRA_LCD)
-      ui.setstatusPGM(PSTR("Fixed Length Prime."), 99);
+      ui.set_status_P(PSTR("Fixed Length Prime."), 99);
       ui.quick_feedback();
     #endif
     set_destination_from_current();
@@ -894,7 +894,7 @@ void GcodeSuite::G26() {
   } while (--g26_repeats && location.x_index >= 0 && location.y_index >= 0);
 
   LEAVE:
-  ui.setstatusPGM(PSTR("Leaving G26"), -1);
+  ui.set_status_P(PSTR("Leaving G26"), -1);
 
   retract_filament(destination);
   destination[Z_AXIS] = Z_CLEARANCE_BETWEEN_PROBES;
diff --git a/Marlin/src/gcode/calibrate/G33.cpp b/Marlin/src/gcode/calibrate/G33.cpp
index bb515a6ea..359f7dfe3 100644
--- a/Marlin/src/gcode/calibrate/G33.cpp
+++ b/Marlin/src/gcode/calibrate/G33.cpp
@@ -522,7 +522,7 @@ void GcodeSuite::G33() {
   if (verbose_level == 0) SERIAL_PROTOCOLPGM(" (DRY-RUN)");
   if (set_up) SERIAL_PROTOCOLPGM("  (SET-UP)");
   SERIAL_EOL();
-  ui.setstatusPGM(checkingac);
+  ui.set_status_P(checkingac);
 
   print_calibration_settings(_endstop_results, _angle_results);
 
@@ -683,7 +683,7 @@ void GcodeSuite::G33() {
           sprintf_P(&mess[15], PSTR("0.%03i"), (int)LROUND(zero_std_dev_min * 1000.0));
         else
           sprintf_P(&mess[15], PSTR("%03i.x"), (int)LROUND(zero_std_dev_min));
-        ui.setstatus(mess);
+        ui.set_status(mess);
         print_calibration_settings(_endstop_results, _angle_results);
         serialprintPGM(save_message);
         SERIAL_EOL();
@@ -699,7 +699,7 @@ void GcodeSuite::G33() {
         SERIAL_PROTOCOLPGM("std dev:");
         SERIAL_PROTOCOL_F(zero_std_dev, 3);
         SERIAL_EOL();
-        ui.setstatus(mess);
+        ui.set_status(mess);
         if (verbose_level > 1)
           print_calibration_settings(_endstop_results, _angle_results);
       }
@@ -719,7 +719,7 @@ void GcodeSuite::G33() {
         sprintf_P(&mess[15], PSTR("0.%03i"), (int)LROUND(zero_std_dev * 1000.0));
       else
         sprintf_P(&mess[15], PSTR("%03i.x"), (int)LROUND(zero_std_dev));
-      ui.setstatus(mess);
+      ui.set_status(mess);
     }
     ac_home();
   }
diff --git a/Marlin/src/gcode/lcd/M0_M1.cpp b/Marlin/src/gcode/lcd/M0_M1.cpp
index 3357e99c1..04ee285ce 100644
--- a/Marlin/src/gcode/lcd/M0_M1.cpp
+++ b/Marlin/src/gcode/lcd/M0_M1.cpp
@@ -62,7 +62,7 @@ void GcodeSuite::M0_M1() {
   #if HAS_LCD_MENU
 
     if (has_message)
-      ui.setstatus(args, true);
+      ui.set_status(args, true);
     else {
       LCD_MESSAGEPGM(MSG_USERWAIT);
       #if ENABLED(LCD_PROGRESS_BAR) && PROGRESS_MSG_EXPIRE > 0
diff --git a/Marlin/src/gcode/lcd/M117.cpp b/Marlin/src/gcode/lcd/M117.cpp
index c35a048a5..1db6b004f 100644
--- a/Marlin/src/gcode/lcd/M117.cpp
+++ b/Marlin/src/gcode/lcd/M117.cpp
@@ -28,6 +28,6 @@
  */
 void GcodeSuite::M117() {
 
-  ui.setstatus(parser.string_arg);
+  ui.set_status(parser.string_arg);
 
 }
diff --git a/Marlin/src/gcode/sdcard/M20-M30_M32-M34_M524_M928.cpp b/Marlin/src/gcode/sdcard/M20-M30_M32-M34_M524_M928.cpp
index 379c4e054..eac8707f9 100644
--- a/Marlin/src/gcode/sdcard/M20-M30_M32-M34_M524_M928.cpp
+++ b/Marlin/src/gcode/sdcard/M20-M30_M32-M34_M524_M928.cpp
@@ -28,6 +28,7 @@
 #include "../../sd/cardreader.h"
 #include "../../module/printcounter.h"
 #include "../../module/stepper.h"
+#include "../../lcd/ultralcd.h"
 
 #if ENABLED(POWER_LOSS_RECOVERY)
   #include "../../feature/power_loss_recovery.h"
@@ -100,6 +101,8 @@ void GcodeSuite::M24() {
     else
   #endif
       print_job_timer.start();
+
+  ui.reset_status();
 }
 
 /**
diff --git a/Marlin/src/gcode/stats/M31.cpp b/Marlin/src/gcode/stats/M31.cpp
index 121a0cc80..98eb3a973 100644
--- a/Marlin/src/gcode/stats/M31.cpp
+++ b/Marlin/src/gcode/stats/M31.cpp
@@ -40,7 +40,7 @@ void GcodeSuite::M31() {
   char buffer[21];
   duration_t elapsed = print_job_timer.duration();
   elapsed.toString(buffer);
-  ui.setstatus(buffer);
+  ui.set_status(buffer);
 
   SERIAL_ECHO_START_P(port);
   SERIAL_ECHOLNPAIR_P(port, "Print time: ", buffer);
diff --git a/Marlin/src/gcode/temperature/M140_M190.cpp b/Marlin/src/gcode/temperature/M140_M190.cpp
index a70a6fdc8..2da964f05 100644
--- a/Marlin/src/gcode/temperature/M140_M190.cpp
+++ b/Marlin/src/gcode/temperature/M140_M190.cpp
@@ -64,7 +64,7 @@ void GcodeSuite::M190() {
   }
   else return;
 
-  ui.setstatusPGM(thermalManager.isHeatingBed() ? PSTR(MSG_BED_HEATING) : PSTR(MSG_BED_COOLING));
+  ui.set_status_P(thermalManager.isHeatingBed() ? PSTR(MSG_BED_HEATING) : PSTR(MSG_BED_COOLING));
 
   thermalManager.wait_for_bed(no_wait_for_cooling);
 }
diff --git a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
index e02423e64..126ef00b5 100644
--- a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
+++ b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
@@ -99,10 +99,6 @@ void ST7920_Lite_Status_Screen::write_str_P(PGM_P const str) {
   while (char c = pgm_read_byte(p_str++)) write_byte(c);
 }
 
-void ST7920_Lite_Status_Screen::write_str(progmem_str str) {
-  write_str_P((PGM_P)str);
-}
-
 void ST7920_Lite_Status_Screen::write_number(const int16_t value, const uint8_t digits/*=3*/) {
   char str[7];
   PGM_P fmt;
@@ -501,11 +497,11 @@ void ST7920_Lite_Status_Screen::draw_progress_bar(const uint8_t value) {
   // Draw centered
   if (value > 9) {
     write_number(value, 4);
-    write_str(F("% "));
+    write_str_P(PSTR("% "));
   }
   else {
     write_number(value, 3);
-    write_str(F("%  "));
+    write_str_P(PSTR("%  "));
   }
 }
 
@@ -558,12 +554,12 @@ void ST7920_Lite_Status_Screen::draw_temps(uint8_t line, const int16_t temp, con
   write_number(temp);
 
   if (showTarget) {
-    write_str(F("\x1A"));
+    write_byte('\x1A');
     write_number(target);
   };
 
   if (targetStateChange) {
-    if (!showTarget) write_str(F("    "));
+    if (!showTarget) write_str_P(PSTR("    "));
     draw_degree_symbol(5, line, !showTarget);
     draw_degree_symbol(9, line,  showTarget);
   }
diff --git a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h
index 79cc1b1fd..8a19030d6 100644
--- a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h
+++ b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h
@@ -18,8 +18,6 @@
 #include "../../core/macros.h"
 #include "../../libs/duration_t.h"
 
-typedef const __FlashStringHelper *progmem_str;
-
 class ST7920_Lite_Status_Screen {
   private:
     static struct st7920_state_t {
@@ -47,7 +45,6 @@ class ST7920_Lite_Status_Screen {
     static void write_str(const char *str);
     static void write_str(const char *str, const uint8_t len);
     static void write_str_P(PGM_P const str);
-    static void write_str(progmem_str str);
     static void write_number(const int16_t value, const uint8_t digits=3);
 
     static void _extended_function_set(const bool extended, const bool graphics);
diff --git a/Marlin/src/lcd/extensible_ui/lib/example.cpp b/Marlin/src/lcd/extensible_ui/lib/example.cpp
index d12e3489f..51040cde0 100644
--- a/Marlin/src/lcd/extensible_ui/lib/example.cpp
+++ b/Marlin/src/lcd/extensible_ui/lib/example.cpp
@@ -55,8 +55,7 @@ namespace ExtUI {
   void onPrintTimerPaused() {}
   void onPrintTimerStopped() {}
   void onFilamentRunout() {}
-  void onStatusChanged(const char* msg) {}
-  void onStatusChanged(progmem_str msg) {}
+  void onStatusChanged(const char * const msg) {}
   void onFactoryReset() {}
   void onLoadSettings() {}
   void onStoreSettings() {}
diff --git a/Marlin/src/lcd/extensible_ui/ui_api.cpp b/Marlin/src/lcd/extensible_ui/ui_api.cpp
index 390b08117..401ae38d9 100644
--- a/Marlin/src/lcd/extensible_ui/ui_api.cpp
+++ b/Marlin/src/lcd/extensible_ui/ui_api.cpp
@@ -94,6 +94,7 @@ static struct {
 } flags;
 
 namespace ExtUI {
+
   #ifdef __SAM3X8E__
     /**
      * Implement a special millis() to allow time measurement
@@ -134,12 +135,7 @@ namespace ExtUI {
       return (uint32_t)(currTime / (F_CPU / 8000));
     }
 
-  #else
-
-    // TODO: Implement for AVR
-    FORCE_INLINE uint32_t safe_millis() { return millis(); }
-
-  #endif
+  #endif // __SAM3X8E__
 
   void delay_us(unsigned long us) {
     DELAY_US(us);
@@ -287,12 +283,14 @@ namespace ExtUI {
   }
 
   void setActiveTool(const extruder_t extruder, bool no_move) {
-    const uint8_t e = extruder - E0;
-    #if DO_SWITCH_EXTRUDER || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
-      if (e != active_extruder)
-        tool_change(e, 0, no_move);
+    #if EXTRUDERS > 1
+      const uint8_t e = extruder - E0;
+      #if DO_SWITCH_EXTRUDER || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
+        if (e != active_extruder)
+          tool_change(e, 0, no_move);
+      #endif
+      active_extruder = e;
     #endif
-    active_extruder = e;
   }
 
   extruder_t getActiveTool() {
@@ -533,24 +531,26 @@ namespace ExtUI {
 
   float getFeedrate_percent() { return feedrate_percentage; }
 
-  void enqueueCommands(progmem_str gcode) {
-    enqueue_and_echo_commands_P((PGM_P)gcode);
+  void enqueueCommands_P(PGM_P const gcode) {
+    enqueue_and_echo_commands_P(gcode);
   }
 
   bool isAxisPositionKnown(const axis_t axis) {
     return TEST(axis_known_position, axis);
   }
 
-  progmem_str getFirmwareName_str() {
-    return F("Marlin " SHORT_BUILD_VERSION);
+  PGM_P getFirmwareName_str() {
+    static const char firmware_name[] PROGMEM = "Marlin " SHORT_BUILD_VERSION;
+    return firmware_name;
   }
 
   void setTargetTemp_celsius(float value, const heater_t heater) {
     #if HAS_HEATED_BED
-    if (heater == BED)
-      thermalManager.setTargetBed(clamp(value,0,200));
+      if (heater == BED)
+        thermalManager.setTargetBed(clamp(value,0,200));
+      else
     #endif
-      thermalManager.setTargetHotend(clamp(value,0,500), heater - H0);
+        thermalManager.setTargetHotend(clamp(value,0,500), heater - H0);
   }
 
   void setTargetTemp_celsius(float value, const extruder_t extruder) {
@@ -579,7 +579,7 @@ namespace ExtUI {
   }
 
   bool isPrinting() {
-    return (planner.movesplanned() || IS_SD_PRINTING() || isPrintingFromMedia());
+    return (planner.movesplanned() || isPrintingFromMedia() || IFSD(IS_SD_PRINTING(), false));
   }
 
   bool isMediaInserted() {
@@ -593,19 +593,20 @@ namespace ExtUI {
       #if ENABLED(PARK_HEAD_ON_PAUSE)
         enqueue_and_echo_commands_P(PSTR("M125"));
       #endif
-      ExtUI::onStatusChanged(PSTR(MSG_PRINT_PAUSED));
+      ui.set_status_P(PSTR(MSG_PRINT_PAUSED));
     #endif
   }
 
   void resumePrint() {
     #if ENABLED(SDSUPPORT)
+      ui.set_status_P(PSTR(MSG_FILAMENT_CHANGE_RESUME_1));
       #if ENABLED(PARK_HEAD_ON_PAUSE)
+        wait_for_heatup = wait_for_user = false;
         enqueue_and_echo_commands_P(PSTR("M24"));
       #else
         card.startFileprint();
         print_job_timer.start();
       #endif
-      ExtUI::onStatusChanged(PSTR(MSG_PRINTING));
     #endif
   }
 
@@ -613,7 +614,7 @@ namespace ExtUI {
     #if ENABLED(SDSUPPORT)
       wait_for_heatup = wait_for_user = false;
       card.flag.abort_sd_printing = true;
-      ExtUI::onStatusChanged(PSTR(MSG_PRINT_ABORTED));
+      ui.set_status_P(PSTR(MSG_PRINT_ABORTED));
     #endif
   }
 
@@ -621,7 +622,7 @@ namespace ExtUI {
 
   void FileList::refresh() { num_files = 0xFFFF; }
 
-  bool FileList::seek(uint16_t pos, bool skip_range_check) {
+  bool FileList::seek(const uint16_t pos, const bool skip_range_check) {
     #if ENABLED(SDSUPPORT)
       if (!skip_range_check && pos > (count() - 1)) return false;
       const uint16_t nr =
@@ -632,6 +633,8 @@ namespace ExtUI {
 
       card.getfilename_sorted(nr);
       return card.filename && card.filename[0] != '\0';
+    #else
+      return false;
     #endif
   }
 
@@ -671,7 +674,7 @@ namespace ExtUI {
     #endif
   }
 
-  void FileList::changeDir(const char *dirname) {
+  void FileList::changeDir(const char * const dirname) {
     #if ENABLED(SDSUPPORT)
       card.chdir(dirname);
       num_files = 0xFFFF;
@@ -713,20 +716,6 @@ void MarlinUI::update() {
   ExtUI::onIdle();
 }
 
-void MarlinUI::setstatus(const char * const message, const bool persist/*=false*/)  { ExtUI::onStatusChanged(message); }
-void MarlinUI::setstatusPGM(PGM_P const message, int8_t level/*=0*/)                { ExtUI::onStatusChanged((progmem_str)message); }
-void MarlinUI::setalertstatusPGM(PGM_P const message)                               { setstatusPGM(message, 0); }
-
-void MarlinUI::status_printf_P(const uint8_t level, const char * const fmt, ...) {
-  char buff[64];
-  va_list args;
-  va_start(args, fmt);
-  vsnprintf_P(buff, sizeof(buff), fmt, args);
-  va_end(args);
-  buff[63] = '\0';
-  ExtUI::onStatusChanged(buff);
-}
-
 void MarlinUI::kill_screen(PGM_P const msg) {
   if (!flags.printer_killed) {
     flags.printer_killed = true;
diff --git a/Marlin/src/lcd/extensible_ui/ui_api.h b/Marlin/src/lcd/extensible_ui/ui_api.h
index 1c8ffe53a..ece25aa23 100644
--- a/Marlin/src/lcd/extensible_ui/ui_api.h
+++ b/Marlin/src/lcd/extensible_ui/ui_api.h
@@ -45,8 +45,6 @@
 
 #include "../../inc/MarlinConfig.h"
 
-typedef const __FlashStringHelper *progmem_str;
-
 namespace ExtUI {
 
   enum axis_t     : uint8_t { X, Y, Z };
@@ -62,13 +60,13 @@ namespace ExtUI {
   bool isAxisPositionKnown(const axis_t);
   bool canMove(const axis_t);
   bool canMove(const extruder_t);
-  void enqueueCommands(progmem_str);
+  void enqueueCommands_P(PGM_P const);
 
   /**
    * Getters and setters
    * Should be used by the EXTENSIBLE_UI to query or change Marlin's state.
    */
-  progmem_str getFirmwareName_str();
+  PGM_P getFirmwareName_str();
 
   float getActualTemp_celsius(const heater_t);
   float getActualTemp_celsius(const extruder_t);
@@ -178,7 +176,12 @@ namespace ExtUI {
    * safe_millis must be called at least every 1 sec to guarantee time
    * yield should be called within lengthy loops
    */
-  uint32_t safe_millis();
+  #ifdef __SAM3X8E__
+    uint32_t safe_millis();
+  #else
+    #define safe_millis() millis() // TODO: Implement for AVR
+  #endif
+
   void delay_us(unsigned long us);
   void delay_ms(unsigned long ms);
   void yield();
@@ -205,14 +208,14 @@ namespace ExtUI {
     public:
       FileList();
       void refresh();
-      bool seek(uint16_t, bool skip_range_check = false);
+      bool seek(const uint16_t, const bool skip_range_check = false);
 
       const char *longFilename();
       const char *shortFilename();
       const char *filename();
       bool isDir();
 
-      void changeDir(const char *dirname);
+      void changeDir(const char * const dirname);
       void upDir();
       bool isAtRootDir();
       uint16_t    count();
@@ -234,8 +237,7 @@ namespace ExtUI {
   void onPrintTimerPaused();
   void onPrintTimerStopped();
   void onFilamentRunout();
-  void onStatusChanged(const char* msg);
-  void onStatusChanged(progmem_str msg);
+  void onStatusChanged(const char * const msg);
   void onFactoryReset();
   void onStoreSettings();
   void onLoadSettings();
diff --git a/Marlin/src/lcd/malyanlcd.cpp b/Marlin/src/lcd/malyanlcd.cpp
index 5380497ee..0df6a8937 100644
--- a/Marlin/src/lcd/malyanlcd.cpp
+++ b/Marlin/src/lcd/malyanlcd.cpp
@@ -480,7 +480,7 @@ void MarlinUI::init() {
 /**
  * Set an alert.
  */
-void MarlinUI::setalertstatusPGM(PGM_P const message) {
+void MarlinUI::set_alert_status_P(PGM_P const message) {
   write_to_lcd_P(PSTR("{E:"));
   write_to_lcd_P(message);
   write_to_lcd_P("}");
diff --git a/Marlin/src/lcd/menu/menu_main.cpp b/Marlin/src/lcd/menu/menu_main.cpp
index 823e0c8b8..e7665bba4 100644
--- a/Marlin/src/lcd/menu/menu_main.cpp
+++ b/Marlin/src/lcd/menu/menu_main.cpp
@@ -59,7 +59,7 @@
   void lcd_sdcard_stop() {
     wait_for_heatup = wait_for_user = false;
     card.flag.abort_sd_printing = true;
-    ui.setstatusPGM(PSTR(MSG_PRINT_ABORTED), -1);
+    ui.set_status_P(PSTR(MSG_PRINT_ABORTED), -1);
     ui.return_to_status();
   }
 
diff --git a/Marlin/src/lcd/ultralcd.cpp b/Marlin/src/lcd/ultralcd.cpp
index 0f290eac2..611bdfed1 100644
--- a/Marlin/src/lcd/ultralcd.cpp
+++ b/Marlin/src/lcd/ultralcd.cpp
@@ -29,6 +29,16 @@
     #include "../sd/cardreader.h"
   #endif
   MarlinUI ui;
+  #if ENABLED(SDSUPPORT)
+    #include "../sd/cardreader.h"
+  #endif
+  #if ENABLED(EXTENSIBLE_UI)
+    #define START_OF_UTF8_CHAR(C) (((C) & 0xC0u) != 0x80u)
+  #endif
+
+  #define MAX_MESSAGE_LENGTH 63
+  uint8_t MarlinUI::status_message_level; // = 0
+  char MarlinUI::status_message[MAX_MESSAGE_LENGTH + 1];
 #endif
 
 #if HAS_SPI_LCD
@@ -86,9 +96,7 @@
   bool MarlinUI::defer_return_to_status;
 #endif
 
-char MarlinUI::status_message[MAX_MESSAGE_LENGTH + 1];
 uint8_t MarlinUI::lcd_status_update_delay = 1; // First update one loop delayed
-uint8_t MarlinUI::status_message_level; // = 0
 
 #if ENABLED(FILAMENT_LCD_DISPLAY) && ENABLED(SDSUPPORT)
   millis_t MarlinUI::next_filament_display; // = 0
@@ -475,7 +483,7 @@ void MarlinUI::status_screen() {
 
 void MarlinUI::kill_screen(PGM_P lcd_msg) {
   init();
-  setalertstatusPGM(lcd_msg);
+  set_alert_status_P(lcd_msg);
   draw_kill_screen();
 }
 
@@ -674,11 +682,11 @@ void MarlinUI::update() {
         if (old_sd_status == 2)
           card.beginautostart();  // Initial boot
         else
-          setstatusPGM(PSTR(MSG_SD_INSERTED));
+          set_status_P(PSTR(MSG_SD_INSERTED));
       }
       else {
         card.release();
-        if (old_sd_status != 2) setstatusPGM(PSTR(MSG_SD_REMOVED));
+        if (old_sd_status != 2) set_status_P(PSTR(MSG_SD_REMOVED));
       }
 
       refresh();
@@ -1083,110 +1091,118 @@ void MarlinUI::update() {
 
 #endif // HAS_ENCODER_ACTION
 
-////////////////////////////////////////////
-/////////////// Status Line ////////////////
-////////////////////////////////////////////
+#endif // HAS_SPI_LCD
 
-void MarlinUI::finishstatus(const bool persist) {
+#if HAS_SPI_LCD || ENABLED(EXTENSIBLE_UI)
 
-  #if !(ENABLED(LCD_PROGRESS_BAR) && (PROGRESS_MSG_EXPIRE > 0))
-    UNUSED(persist);
+  #if ENABLED(EXTENSIBLE_UI)
+    #include "extensible_ui/ui_api.h"
   #endif
 
-  #if ENABLED(LCD_PROGRESS_BAR)
-    progress_bar_ms = millis();
-    #if PROGRESS_MSG_EXPIRE > 0
-      expire_status_ms = persist ? 0 : progress_bar_ms + PROGRESS_MSG_EXPIRE;
+  ////////////////////////////////////////////
+  /////////////// Status Line ////////////////
+  ////////////////////////////////////////////
+
+  void MarlinUI::finishstatus(const bool persist) {
+
+    #if !(ENABLED(LCD_PROGRESS_BAR) && (PROGRESS_MSG_EXPIRE > 0))
+      UNUSED(persist);
     #endif
-  #endif
 
-  #if ENABLED(FILAMENT_LCD_DISPLAY) && ENABLED(SDSUPPORT)
-    next_filament_display = millis() + 5000UL; // Show status message for 5s
-  #endif
+    #if ENABLED(LCD_PROGRESS_BAR)
+      progress_bar_ms = millis();
+      #if PROGRESS_MSG_EXPIRE > 0
+        expire_status_ms = persist ? 0 : progress_bar_ms + PROGRESS_MSG_EXPIRE;
+      #endif
+    #endif
 
-  #if ENABLED(STATUS_MESSAGE_SCROLLING)
-    status_scroll_offset = 0;
-  #endif
+    #if ENABLED(FILAMENT_LCD_DISPLAY) && ENABLED(SDSUPPORT)
+      next_filament_display = millis() + 5000UL; // Show status message for 5s
+    #endif
 
-  refresh();
-}
+    #if ENABLED(STATUS_MESSAGE_SCROLLING)
+      status_scroll_offset = 0;
+    #endif
 
-bool MarlinUI::has_status() { return (status_message[0] != '\0'); }
+    #if ENABLED(EXTENSIBLE_UI)
+      ExtUI::onStatusChanged(status_message);
+    #endif
 
-void MarlinUI::setstatus(const char * const message, const bool persist) {
-  if (status_message_level > 0) return;
+    refresh();
+  }
 
-  // Here we have a problem. The message is encoded in UTF8, so
-  // arbitrarily cutting it will be a problem. We MUST be sure
-  // that there is no cutting in the middle of a multibyte character!
+  bool MarlinUI::has_status() { return (status_message[0] != '\0'); }
 
-  // Get a pointer to the null terminator
-  const char* pend = message + strlen(message);
+  void MarlinUI::set_status(const char * const message, const bool persist) {
+    if (status_message_level > 0) return;
 
-  //  If length of supplied UTF8 string is greater than
-  // our buffer size, start cutting whole UTF8 chars
-  while ((pend - message) > MAX_MESSAGE_LENGTH) {
-    --pend;
-    while (!START_OF_UTF8_CHAR(*pend)) --pend;
-  };
+    // Here we have a problem. The message is encoded in UTF8, so
+    // arbitrarily cutting it will be a problem. We MUST be sure
+    // that there is no cutting in the middle of a multibyte character!
 
-  // At this point, we have the proper cut point. Use it
-  uint8_t maxLen = pend - message;
-  strncpy(status_message, message, maxLen);
-  status_message[maxLen] = '\0';
+    // Get a pointer to the null terminator
+    const char* pend = message + strlen(message);
 
-  finishstatus(persist);
-}
+    //  If length of supplied UTF8 string is greater than
+    // our buffer size, start cutting whole UTF8 chars
+    while ((pend - message) > MAX_MESSAGE_LENGTH) {
+      --pend;
+      while (!START_OF_UTF8_CHAR(*pend)) --pend;
+    };
 
-#include <stdarg.h>
+    // At this point, we have the proper cut point. Use it
+    uint8_t maxLen = pend - message;
+    strncpy(status_message, message, maxLen);
+    status_message[maxLen] = '\0';
 
-void MarlinUI::status_printf_P(const uint8_t level, PGM_P const fmt, ...) {
-  if (level < status_message_level) return;
-  status_message_level = level;
-  va_list args;
-  va_start(args, fmt);
-  vsnprintf_P(status_message, MAX_MESSAGE_LENGTH, fmt, args);
-  va_end(args);
-  finishstatus(level > 0);
-}
+    finishstatus(persist);
+  }
 
-void MarlinUI::setstatusPGM(PGM_P const message, int8_t level) {
-  if (level < 0) level = status_message_level = 0;
-  if (level < status_message_level) return;
-  status_message_level = level;
+  #include <stdarg.h>
 
-  // Here we have a problem. The message is encoded in UTF8, so
-  // arbitrarily cutting it will be a problem. We MUST be sure
-  // that there is no cutting in the middle of a multibyte character!
+  void MarlinUI::status_printf_P(const uint8_t level, PGM_P const fmt, ...) {
+    if (level < status_message_level) return;
+    status_message_level = level;
+    va_list args;
+    va_start(args, fmt);
+    vsnprintf_P(status_message, MAX_MESSAGE_LENGTH, fmt, args);
+    va_end(args);
+    finishstatus(level > 0);
+  }
 
-  // Get a pointer to the null terminator
-  PGM_P pend = message + strlen_P(message);
+  void MarlinUI::set_status_P(PGM_P const message, int8_t level) {
+    if (level < 0) level = status_message_level = 0;
+    if (level < status_message_level) return;
+    status_message_level = level;
 
-  //  If length of supplied UTF8 string is greater than
-  // our buffer size, start cutting whole UTF8 chars
-  while ((pend - message) > MAX_MESSAGE_LENGTH) {
-    --pend;
-    while (!START_OF_UTF8_CHAR(pgm_read_byte(pend))) --pend;
-  };
+    // Here we have a problem. The message is encoded in UTF8, so
+    // arbitrarily cutting it will be a problem. We MUST be sure
+    // that there is no cutting in the middle of a multibyte character!
 
-  // At this point, we have the proper cut point. Use it
-  uint8_t maxLen = pend - message;
-  strncpy_P(status_message, message, maxLen);
-  status_message[maxLen] = '\0';
+    // Get a pointer to the null terminator
+    PGM_P pend = message + strlen_P(message);
 
-  finishstatus(level > 0);
-}
+    //  If length of supplied UTF8 string is greater than
+    // our buffer size, start cutting whole UTF8 chars
+    while ((pend - message) > MAX_MESSAGE_LENGTH) {
+      --pend;
+      while (!START_OF_UTF8_CHAR(pgm_read_byte(pend))) --pend;
+    };
 
-void MarlinUI::setalertstatusPGM(PGM_P const message) {
-  setstatusPGM(message, 1);
-  #if HAS_LCD_MENU
-    return_to_status();
-  #endif
-}
+    // At this point, we have the proper cut point. Use it
+    uint8_t maxLen = pend - message;
+    strncpy_P(status_message, message, maxLen);
+    status_message[maxLen] = '\0';
 
-#endif // HAS_SPI_LCD
+    finishstatus(level > 0);
+  }
 
-#if HAS_SPI_LCD || ENABLED(EXTENSIBLE_UI)
+  void MarlinUI::set_alert_status_P(PGM_P const message) {
+    set_status_P(message, 1);
+    #if HAS_LCD_MENU
+      return_to_status();
+    #endif
+  }
 
   #include "../module/printcounter.h"
 
@@ -1202,14 +1218,14 @@ void MarlinUI::setalertstatusPGM(PGM_P const message) {
       msg = paused;
     #if ENABLED(SDSUPPORT)
       else if (IS_SD_PRINTING())
-        return setstatus(card.longest_filename(), true);
+        return set_status(card.longest_filename(), true);
     #endif
     else if (print_job_timer.isRunning())
       msg = printing;
     else
       msg = welcome;
 
-    setstatusPGM(msg, -1);
+    set_status_P(msg, -1);
   }
 
 #endif
diff --git a/Marlin/src/lcd/ultralcd.h b/Marlin/src/lcd/ultralcd.h
index 4723eb503..b190e3c4b 100644
--- a/Marlin/src/lcd/ultralcd.h
+++ b/Marlin/src/lcd/ultralcd.h
@@ -243,15 +243,22 @@ public:
   #if HAS_SPI_LCD || ENABLED(MALYAN_LCD) || ENABLED(EXTENSIBLE_UI)
     static void init();
     static void update();
-    static void setalertstatusPGM(PGM_P message);
+    static void set_alert_status_P(PGM_P message);
   #else // NO LCD
     static inline void init() {}
     static inline void update() {}
-    static inline void setalertstatusPGM(PGM_P message) { UNUSED(message); }
+    static inline void set_alert_status_P(PGM_P message) { UNUSED(message); }
   #endif
 
   #if HAS_SPI_LCD || ENABLED(EXTENSIBLE_UI)
 
+    static char status_message[];
+    static bool has_status();
+
+
+    static uint8_t status_message_level;      // Higher levels block lower levels
+    static inline void reset_alert_level() { status_message_level = 0; }
+
     #if HAS_SPI_LCD
 
       static bool detected();
@@ -296,16 +303,10 @@ public:
 
       #endif
 
-      // Status message
-      static char status_message[];
       #if ENABLED(STATUS_MESSAGE_SCROLLING)
         static uint8_t status_scroll_offset;
       #endif
-      static bool has_status();
-
       static uint8_t lcd_status_update_delay;
-      static uint8_t status_message_level;      // Higher levels block lower levels
-      static inline void reset_alert_level() { status_message_level = 0; }
 
       #if HAS_PRINT_PROGRESS
         #if ENABLED(LCD_SET_PROGRESS_MANUALLY)
@@ -341,26 +342,22 @@ public:
       static void status_screen();
 
     #else
-
       static void refresh() {}
-      static inline void reset_alert_level() {}
-      static constexpr bool has_status() { return true; }
-
     #endif
 
     static bool get_blink();
     static void kill_screen(PGM_P const lcd_msg);
     static void draw_kill_screen();
-    static void setstatus(const char* const message, const bool persist=false);
-    static void setstatusPGM(PGM_P const message, const int8_t level=0);
+    static void set_status(const char* const message, const bool persist=false);
+    static void set_status_P(PGM_P const message, const int8_t level=0);
     static void status_printf_P(const uint8_t level, PGM_P const fmt, ...);
     static void reset_status();
 
   #else // MALYAN_LCD or NO LCD
 
     static inline void refresh() {}
-    static inline void setstatus(const char* const message, const bool persist=false) { UNUSED(message); UNUSED(persist); }
-    static inline void setstatusPGM(PGM_P const message, const int8_t level=0) { UNUSED(message); UNUSED(level); }
+    static inline void set_status(const char* const message, const bool persist=false) { UNUSED(message); UNUSED(persist); }
+    static inline void set_status_P(PGM_P const message, const int8_t level=0) { UNUSED(message); UNUSED(level); }
     static inline void status_printf_P(const uint8_t level, PGM_P const fmt, ...) { UNUSED(level); UNUSED(fmt); }
     static inline void reset_status() {}
     static inline void reset_alert_level() {}
@@ -508,6 +505,10 @@ private:
 
   static void _synchronize();
 
+  #if HAS_SPI_LCD || ENABLED(EXTENSIBLE_UI)
+    static void finishstatus(const bool persist);
+  #endif
+
   #if HAS_SPI_LCD
     #if HAS_LCD_MENU
       #if LCD_TIMEOUT_TO_STATUS
@@ -517,13 +518,10 @@ private:
       #endif
     #endif
     static void draw_status_screen();
-    static void finishstatus(const bool persist);
-  #else
-    static inline void finishstatus(const bool persist) { UNUSED(persist); refresh(); }
   #endif
 };
 
 extern MarlinUI ui;
 
-#define LCD_MESSAGEPGM(x)      ui.setstatusPGM(PSTR(x))
-#define LCD_ALERTMESSAGEPGM(x) ui.setalertstatusPGM(PSTR(x))
+#define LCD_MESSAGEPGM(x)      ui.set_status_P(PSTR(x))
+#define LCD_ALERTMESSAGEPGM(x) ui.set_alert_status_P(PSTR(x))
diff --git a/Marlin/src/module/probe.cpp b/Marlin/src/module/probe.cpp
index 559771441..6d535eeef 100644
--- a/Marlin/src/module/probe.cpp
+++ b/Marlin/src/module/probe.cpp
@@ -371,7 +371,7 @@ FORCE_INLINE void probe_specific_action(const bool deploy) {
 
     PGM_P const ds_str = deploy ? PSTR(MSG_MANUAL_DEPLOY) : PSTR(MSG_MANUAL_STOW);
     ui.return_to_status();       // To display the new status message
-    ui.setstatusPGM(ds_str, 99);
+    ui.set_status_P(ds_str, 99);
     serialprintPGM(ds_str);
     SERIAL_EOL();
 
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 489a06dc5..57f782e9e 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -2464,7 +2464,7 @@ void Temperature::isr() {
       #if HOTENDS > 1
         ui.status_printf_P(0, heating ? PSTR("E%i " MSG_HEATING) : PSTR("E%i " MSG_COOLING), int(e + 1));
       #else
-        ui.setstatusPGM(heating ? PSTR("E " MSG_HEATING) : PSTR("E " MSG_COOLING));
+        ui.set_status_P(heating ? PSTR("E " MSG_HEATING) : PSTR("E " MSG_COOLING));
       #endif
     }
   #endif
diff --git a/Marlin/src/sd/cardreader.cpp b/Marlin/src/sd/cardreader.cpp
index 949c530a0..ab24f53e6 100644
--- a/Marlin/src/sd/cardreader.cpp
+++ b/Marlin/src/sd/cardreader.cpp
@@ -521,7 +521,7 @@ void CardReader::openFile(char * const path, const bool read, const bool subcall
       SERIAL_PROTOCOLLNPGM(MSG_SD_FILE_SELECTED);
 
       getfilename(0, fname);
-      ui.setstatus(longFilename[0] ? longFilename : fname);
+      ui.set_status(longFilename[0] ? longFilename : fname);
       //if (longFilename[0]) {
       //  SERIAL_PROTOCOLPAIR(MSG_SD_FILE_LONG_NAME, longFilename);
       //}
@@ -545,7 +545,7 @@ void CardReader::openFile(char * const path, const bool read, const bool subcall
         emergency_parser.disable();
       #endif
       SERIAL_PROTOCOLLNPAIR(MSG_SD_WRITE_TO_FILE, fname);
-      ui.setstatus(fname);
+      ui.set_status(fname);
     }
   }
 }