diff --git a/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_hw_spi.cpp b/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_hw_spi.cpp
index 9139f1b8d..c4b7966b6 100644
--- a/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_hw_spi.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_hw_spi.cpp
@@ -80,20 +80,13 @@ static uint8_t rs_last_state = 255;
 
 static void u8g_com_LPC1768_st7920_write_byte_hw_spi(uint8_t rs, uint8_t val) {
 
-  if ( rs != rs_last_state) {  // time to send a command/data byte
+  if (rs != rs_last_state) {      // Time to send a command/data byte
     rs_last_state = rs;
-
-    if ( rs == 0 )
-      /* command */
-      spiSend(0x0F8);
-    else
-       /* data */
-      spiSend(0x0FA);
-
-    DELAY_US(40); // give the controller some time to process the data: 20 is bad, 30 is OK, 40 is safe
+    spiSend(rs ? 0x0FA : 0x0F8);  // Send data or command
+    DELAY_US(40);                 // Give the controller some time: 20 is bad, 30 is OK, 40 is safe
   }
 
-  spiSend(val & 0x0F0);
+  spiSend(val & 0xF0);
   spiSend(val << 4);
 }
 
@@ -104,8 +97,8 @@ uint8_t u8g_com_HAL_LPC1768_ST7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t ar
       u8g_SetPIOutput(u8g, U8G_PI_CS);
       u8g_Delay(5);
       spiBegin();
-      spiInit(SPI_EIGHTH_SPEED);  // ST7920 max speed is about 1.1 MHz
-      u8g->pin_list[U8G_PI_A0_STATE] = 0;       /* inital RS state: command mode */
+      spiInit(SPI_EIGHTH_SPEED);            // ST7920 max speed is about 1.1 MHz
+      u8g->pin_list[U8G_PI_A0_STATE] = 0;   // initial RS state: command mode
       break;
 
     case U8G_COM_MSG_STOP:
@@ -115,12 +108,12 @@ uint8_t u8g_com_HAL_LPC1768_ST7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t ar
       u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
       break;
 
-    case U8G_COM_MSG_ADDRESS:                     /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
+    case U8G_COM_MSG_ADDRESS:                   // Define cmd (arg_val = 0) or data mode (arg_val = 1)
       u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
       break;
 
     case U8G_COM_MSG_CHIP_SELECT:
-      u8g_SetPILevel(u8g, U8G_PI_CS, arg_val);  //note: the st7920 has an active high chip select
+      u8g_SetPILevel(u8g, U8G_PI_CS, arg_val);  // Note: the ST7920 has an active high chip-select
       break;
 
     case U8G_COM_MSG_WRITE_BYTE:
diff --git a/Marlin/src/gcode/temperature/M104_M109.cpp b/Marlin/src/gcode/temperature/M104_M109.cpp
index 39d65dc1a..fede0fa8f 100644
--- a/Marlin/src/gcode/temperature/M104_M109.cpp
+++ b/Marlin/src/gcode/temperature/M104_M109.cpp
@@ -125,7 +125,7 @@ void GcodeSuite::M109() {
         print_job_timer.start();
     #endif
 
-    #if ENABLED(ULTRA_LCD)
+    #if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
       if (thermalManager.isHeatingHotend(target_extruder) || !no_wait_for_cooling)
         thermalManager.set_heating_message(target_extruder);
     #endif
diff --git a/Marlin/src/lcd/extensible_ui/ui_api.cpp b/Marlin/src/lcd/extensible_ui/ui_api.cpp
index a9dabaa0a..2c756cdb3 100644
--- a/Marlin/src/lcd/extensible_ui/ui_api.cpp
+++ b/Marlin/src/lcd/extensible_ui/ui_api.cpp
@@ -544,16 +544,20 @@ namespace ExtUI {
   }
 
   void setTargetTemp_celsius(float value, const heater_t heater) {
+    constexpr int16_t heater_maxtemp[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP, HEATER_4_MAXTEMP);
+    const int16_t e = heater - H0;
     #if HAS_HEATED_BED
       if (heater == BED)
-        thermalManager.setTargetBed(clamp(value,0,200));
+        thermalManager.setTargetBed(clamp(value, 0, BED_MAXTEMP - 15));
       else
     #endif
-        thermalManager.setTargetHotend(clamp(value,0,500), heater - H0);
+        thermalManager.setTargetHotend(clamp(value, 0, heater_maxtemp[e] - 15), e);
   }
 
   void setTargetTemp_celsius(float value, const extruder_t extruder) {
-    thermalManager.setTargetHotend(clamp(value,0,500), extruder - E0);
+    constexpr int16_t heater_maxtemp[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP, HEATER_4_MAXTEMP);
+    const int16_t e = extruder - E0;
+    thermalManager.setTargetHotend(clamp(value, 0, heater_maxtemp[e] - 15), e);
   }
 
   void setFan_percent(float value, const fan_t fan) {
diff --git a/Marlin/src/lcd/menu/menu_temperature.cpp b/Marlin/src/lcd/menu/menu_temperature.cpp
index 2883fe752..e0d559025 100644
--- a/Marlin/src/lcd/menu/menu_temperature.cpp
+++ b/Marlin/src/lcd/menu/menu_temperature.cpp
@@ -44,7 +44,7 @@ uint8_t MarlinUI::preheat_fan_speed[2];
 //
 
 void _lcd_preheat(const int16_t endnum, const int16_t temph, const int16_t tempb, const uint8_t fan) {
-  if (temph > 0) thermalManager.setTargetHotend(MIN(heater_maxtemp[endnum], temph), endnum);
+  if (temph > 0) thermalManager.setTargetHotend(MIN(heater_maxtemp[endnum] - 15, temph), endnum);
   #if HAS_HEATED_BED
     if (tempb >= 0) thermalManager.setTargetBed(tempb);
   #else
diff --git a/Marlin/src/module/motion.cpp b/Marlin/src/module/motion.cpp
index be0a6cda8..803ddbc8c 100644
--- a/Marlin/src/module/motion.cpp
+++ b/Marlin/src/module/motion.cpp
@@ -47,7 +47,7 @@
   #include "../feature/bedlevel/bedlevel.h"
 #endif
 
-#if HAS_AXIS_UNHOMED_ERR && ENABLED(ULTRA_LCD)
+#if HAS_AXIS_UNHOMED_ERR && (ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI))
   #include "../lcd/ultralcd.h"
 #endif
 
@@ -1019,7 +1019,7 @@ void prepare_move_to_destination() {
       if (zz) SERIAL_ECHOPGM(MSG_Z);
       SERIAL_ECHOLNPGM(" " MSG_FIRST);
 
-      #if ENABLED(ULTRA_LCD)
+      #if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
         ui.status_printf_P(0, PSTR(MSG_HOME " %s%s%s " MSG_FIRST), xx ? MSG_X : "", yy ? MSG_Y : "", zz ? MSG_Z : "");
       #endif
       return true;
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index cd0a66d6f..8adcd8c67 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -2470,7 +2470,7 @@ void Temperature::isr() {
 
   #endif // AUTO_REPORT_TEMPERATURES
 
-  #if ENABLED(ULTRA_LCD)
+  #if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
     void Temperature::set_heating_message(const uint8_t e) {
       const bool heating = isHeatingHotend(e);
       #if HOTENDS > 1
diff --git a/Marlin/src/module/tool_change.cpp b/Marlin/src/module/tool_change.cpp
index 81dbe9043..2125736cf 100644
--- a/Marlin/src/module/tool_change.cpp
+++ b/Marlin/src/module/tool_change.cpp
@@ -681,7 +681,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
           singlenozzle_temp[active_extruder] = thermalManager.target_temperature[0];
           if (singlenozzle_temp[tmp_extruder] && singlenozzle_temp[tmp_extruder] != singlenozzle_temp[active_extruder]) {
             thermalManager.setTargetHotend(singlenozzle_temp[tmp_extruder], 0);
-            #if ENABLED(ULTRA_LCD)
+            #if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
               thermalManager.set_heating_message(0);
             #endif
             (void)thermalManager.wait_for_hotend(0, false);  // Wait for heating or cooling
diff --git a/Marlin/src/sd/Sd2Card.cpp b/Marlin/src/sd/Sd2Card.cpp
index d1116cdb3..0f959a3cc 100644
--- a/Marlin/src/sd/Sd2Card.cpp
+++ b/Marlin/src/sd/Sd2Card.cpp
@@ -65,7 +65,7 @@
 
     static uint8_t CRC7(const uint8_t* data, uint8_t n) {
       uint8_t crc = 0;
-      while ( n > 0 ) {
+      while (n > 0) {
         crc = pgm_read_byte(&crctab7[ (crc << 1) ^ *data++ ]);
         n--;
       }
@@ -87,44 +87,42 @@
   #endif
 #endif
 
-// send command and return error code.  Return zero for OK
-uint8_t Sd2Card::cardCommand(uint8_t cmd, uint32_t arg) {
-  // select card
+// Send command and return error code. Return zero for OK
+uint8_t Sd2Card::cardCommand(const uint8_t cmd, const uint32_t arg) {
+  // Select card
   chipSelect();
 
-  // wait up to 300 ms if busy
-  waitNotBusy( SD_WRITE_TIMEOUT );
+  // Wait up to 300 ms if busy
+  waitNotBusy(SD_WRITE_TIMEOUT);
 
   uint8_t *pa = (uint8_t *)(&arg);
 
-#if ENABLED(SD_CHECK_AND_RETRY)
+  #if ENABLED(SD_CHECK_AND_RETRY)
 
-  // form message
-  uint8_t d[6] = {(uint8_t) (cmd | 0x40), pa[3], pa[2], pa[1], pa[0] };
+    // Form message
+    uint8_t d[6] = {(uint8_t) (cmd | 0x40), pa[3], pa[2], pa[1], pa[0] };
 
-  // add crc
-  d[5] = CRC7(d, 5);
+    // Add crc
+    d[5] = CRC7(d, 5);
 
-  // send message
-  for (uint8_t k = 0; k < 6; k++ )
-    spiSend( d[k] );
+    // Send message
+    for (uint8_t k = 0; k < 6; k++) spiSend(d[k]);
 
-#else
-  // send command
-  spiSend(cmd | 0x40);
+  #else
+    // Send command
+    spiSend(cmd | 0x40);
 
-  // send argument
-  for( int8_t i = 3; i >= 0; i-- )
-    spiSend( pa[i] );
+    // Send argument
+    for (int8_t i = 3; i >= 0; i--) spiSend(pa[i]);
 
-  // send CRC - correct for CMD0 with arg zero or CMD8 with arg 0X1AA
-  spiSend( cmd == CMD0 ? 0X95 : 0X87 );
-#endif
+    // Send CRC - correct for CMD0 with arg zero or CMD8 with arg 0X1AA
+    spiSend(cmd == CMD0 ? 0X95 : 0X87);
+  #endif
 
-  // skip stuff byte for stop read
+  // Skip stuff byte for stop read
   if (cmd == CMD12) spiRec();
 
-  // wait for response
+  // Wait for response
   for (uint8_t i = 0; ((status_ = spiRec()) & 0x80) && i != 0xFF; i++) { /* Intentionally left empty */ }
   return status_;
 }
@@ -159,9 +157,7 @@ uint32_t Sd2Card::cardSize() {
 
 void Sd2Card::chipDeselect() {
   digitalWrite(chipSelectPin_, HIGH);
-
-  // insure MISO goes high impedance
-  spiSend( 0xFF );
+  spiSend(0xFF); // Ensure MISO goes high impedance
 }
 
 void Sd2Card::chipSelect() {
@@ -195,13 +191,8 @@ bool Sd2Card::erase(uint32_t firstBlock, uint32_t lastBlock) {
       goto FAIL;
     }
   }
-  if (type_ != SD_CARD_TYPE_SDHC) {
-    firstBlock <<= 9;
-    lastBlock <<= 9;
-  }
-  if (cardCommand(CMD32, firstBlock)
-      || cardCommand(CMD33, lastBlock)
-      || cardCommand(CMD38, 0)) {
+  if (type_ != SD_CARD_TYPE_SDHC) { firstBlock <<= 9; lastBlock <<= 9; }
+  if (cardCommand(CMD32, firstBlock) || cardCommand(CMD33, lastBlock) || cardCommand(CMD38, 0)) {
     error(SD_CARD_ERROR_ERASE);
     goto FAIL;
   }
@@ -236,7 +227,7 @@ bool Sd2Card::eraseSingleBlockEnable() {
  * \return true for success, false for failure.
  * The reason for failure can be determined by calling errorCode() and errorData().
  */
-bool Sd2Card::init(uint8_t sckRateID, pin_t chipSelectPin) {
+bool Sd2Card::init(const uint8_t sckRateID/*=0*/, const pin_t chipSelectPin/*=SD_CHIP_SELECT_PIN*/) {
   errorCode_ = type_ = 0;
   chipSelectPin_ = chipSelectPin;
   // 16-bit init start time allows over a minute
@@ -308,23 +299,23 @@ bool Sd2Card::init(uint8_t sckRateID, pin_t chipSelectPin) {
     watchdog_reset();
   #endif
 
-  // initialize card and send host supports SDHC if SD2
+  // Initialize card and send host supports SDHC if SD2
   arg = type() == SD_CARD_TYPE_SD2 ? 0x40000000 : 0;
   while ((status_ = cardAcmd(ACMD41, arg)) != R1_READY_STATE) {
-    // check for timeout
+    // Check for timeout
     if (ELAPSED(millis(), init_timeout)) {
       error(SD_CARD_ERROR_ACMD41);
       goto FAIL;
     }
   }
-  // if SD2 read OCR register to check for SDHC card
+  // If SD2 read OCR register to check for SDHC card
   if (type() == SD_CARD_TYPE_SD2) {
     if (cardCommand(CMD58, 0)) {
       error(SD_CARD_ERROR_CMD58);
       goto FAIL;
     }
     if ((spiRec() & 0xC0) == 0xC0) type(SD_CARD_TYPE_SDHC);
-    // discard rest of ocr - contains allowed voltage range
+    // Discard rest of ocr - contains allowed voltage range
     for (uint8_t i = 0; i < 3; i++) spiRec();
   }
   chipDeselect();
@@ -344,8 +335,7 @@ bool Sd2Card::init(uint8_t sckRateID, pin_t chipSelectPin) {
  * \return true for success, false for failure.
  */
 bool Sd2Card::readBlock(uint32_t blockNumber, uint8_t* dst) {
-  // use address if not SDHC card
-  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
+  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;   // Use address if not SDHC card
 
   #if ENABLED(SD_CHECK_AND_RETRY)
     uint8_t retryCnt = 3;
@@ -447,44 +437,39 @@ bool Sd2Card::readData(uint8_t* dst) {
   #endif
 #endif // SD_CHECK_AND_RETRY
 
-bool Sd2Card::readData(uint8_t* dst, uint16_t count) {
-  // wait for start block token
+bool Sd2Card::readData(uint8_t* dst, const uint16_t count) {
+  bool success = false;
+
   const millis_t read_timeout = millis() + SD_READ_TIMEOUT;
-  while ((status_ = spiRec()) == 0xFF) {
+  while ((status_ = spiRec()) == 0xFF) {      // Wait for start block token
     if (ELAPSED(millis(), read_timeout)) {
       error(SD_CARD_ERROR_READ_TIMEOUT);
       goto FAIL;
     }
   }
-  if (status_ != DATA_START_BLOCK) {
-    error(SD_CARD_ERROR_READ);
-    goto FAIL;
-  }
-  // transfer data
-  spiRead(dst, count);
 
-#if ENABLED(SD_CHECK_AND_RETRY)
-  {
-    uint16_t recvCrc = (spiRec() << 8) | spiRec();
-    if (crcSupported && recvCrc != CRC_CCITT(dst, count)) {
-      error(SD_CARD_ERROR_READ_CRC);
-      goto FAIL;
-    }
+  if (status_ == DATA_START_BLOCK) {
+    spiRead(dst, count);                      // Transfer data
+
+    const uint16_t recvCrc = (spiRec() << 8) | spiRec();
+    #if ENABLED(SD_CHECK_AND_RETRY)
+      success = !crcSupported || recvCrc == CRC_CCITT(dst, count);
+      if (!success) error(SD_CARD_ERROR_READ_CRC);
+    #else
+      success = true;
+      UNUSED(recvCrc);
+    #endif
   }
-#else
-  // discard CRC
-  spiRec();
-  spiRec();
-#endif
-  chipDeselect();
-  return true;
+  else
+    error(SD_CARD_ERROR_READ);
+
   FAIL:
   chipDeselect();
-  return false;
+  return success;
 }
 
 /** read CID or CSR register */
-bool Sd2Card::readRegister(uint8_t cmd, void* buf) {
+bool Sd2Card::readRegister(const uint8_t cmd, void* buf) {
   uint8_t* dst = reinterpret_cast<uint8_t*>(buf);
   if (cardCommand(cmd, 0)) {
     error(SD_CARD_ERROR_READ_REG);
@@ -506,13 +491,11 @@ bool Sd2Card::readRegister(uint8_t cmd, void* buf) {
  */
 bool Sd2Card::readStart(uint32_t blockNumber) {
   if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
-  if (cardCommand(CMD18, blockNumber)) {
-    error(SD_CARD_ERROR_CMD18);
-    chipDeselect();
-    return false;
-  }
+
+  const bool success = !cardCommand(CMD18, blockNumber);
+  if (!success) error(SD_CARD_ERROR_CMD18);
   chipDeselect();
-  return true;
+  return success;
 }
 
 /**
@@ -522,13 +505,10 @@ bool Sd2Card::readStart(uint32_t blockNumber) {
  */
 bool Sd2Card::readStop() {
   chipSelect();
-  if (cardCommand(CMD12, 0)) {
-    error(SD_CARD_ERROR_CMD12);
-    chipDeselect();
-    return false;
-  }
+  const bool success = !cardCommand(CMD12, 0);
+  if (!success) error(SD_CARD_ERROR_CMD12);
   chipDeselect();
-  return true;
+  return success;
 }
 
 /**
@@ -543,16 +523,20 @@ bool Sd2Card::readStop() {
  * \return The value one, true, is returned for success and the value zero,
  * false, is returned for an invalid value of \a sckRateID.
  */
-bool Sd2Card::setSckRate(uint8_t sckRateID) {
-  if (sckRateID > 6) {
+bool Sd2Card::setSckRate(const uint8_t sckRateID) {
+  const bool success = (sckRateID <= 6);
+  if (success) 
+    spiRate_ = sckRateID;
+  else
     error(SD_CARD_ERROR_SCK_RATE);
-    return false;
-  }
-  spiRate_ = sckRateID;
-  return true;
+  return success;
 }
 
-// wait for card to go not busy
+/**
+ * Wait for card to become not-busy
+ * \param[in] timeout_ms Timeout to abort.
+ * \return true for success, false for timeout.
+ */
 bool Sd2Card::waitNotBusy(const millis_t timeout_ms) {
   const millis_t wait_timeout = millis() + timeout_ms;
   while (spiRec() != 0xFF)
@@ -562,36 +546,31 @@ bool Sd2Card::waitNotBusy(const millis_t timeout_ms) {
 }
 
 /**
- * Writes a 512 byte block to an SD card.
+ * Write a 512 byte block to an SD card.
  *
  * \param[in] blockNumber Logical block to be written.
  * \param[in] src Pointer to the location of the data to be written.
  * \return true for success, false for failure.
  */
 bool Sd2Card::writeBlock(uint32_t blockNumber, const uint8_t* src) {
-  // use address if not SDHC card
-  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
-  if (cardCommand(CMD24, blockNumber)) {
-    error(SD_CARD_ERROR_CMD24);
-    goto FAIL;
+  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;   // Use address if not SDHC card
+
+  bool success = false;
+  if (!cardCommand(CMD24, blockNumber)) {
+    if (writeData(DATA_START_BLOCK, src)) {
+      if (waitNotBusy(SD_WRITE_TIMEOUT)) {              // Wait for flashing to complete
+        success = !(cardCommand(CMD13, 0) || spiRec()); // Response is r2 so get and check two bytes for nonzero
+        if (!success) error(SD_CARD_ERROR_WRITE_PROGRAMMING);
+      }
+      else
+        error(SD_CARD_ERROR_WRITE_TIMEOUT);
+    }
   }
-  if (!writeData(DATA_START_BLOCK, src)) goto FAIL;
+  else
+    error(SD_CARD_ERROR_CMD24);
 
-  // wait for flash programming to complete
-  if (!waitNotBusy(SD_WRITE_TIMEOUT)) {
-    error(SD_CARD_ERROR_WRITE_TIMEOUT);
-    goto FAIL;
-  }
-  // response is r2 so get and check two bytes for nonzero
-  if (cardCommand(CMD13, 0) || spiRec()) {
-    error(SD_CARD_ERROR_WRITE_PROGRAMMING);
-    goto FAIL;
-  }
   chipDeselect();
-  return true;
-  FAIL:
-  chipDeselect();
-  return false;
+  return success;
 }
 
 /**
@@ -600,28 +579,30 @@ bool Sd2Card::writeBlock(uint32_t blockNumber, const uint8_t* src) {
  * \return true for success, false for failure.
  */
 bool Sd2Card::writeData(const uint8_t* src) {
+  bool success = true;
   chipSelect();
-  // wait for previous write to finish
+  // Wait for previous write to finish
   if (!waitNotBusy(SD_WRITE_TIMEOUT) || !writeData(WRITE_MULTIPLE_TOKEN, src)) {
     error(SD_CARD_ERROR_WRITE_MULTIPLE);
-    chipDeselect();
-    return false;
+    success = false;
   }
   chipDeselect();
-  return true;
+  return success;
 }
 
-// send one block of data for write block or write multiple blocks
-bool Sd2Card::writeData(uint8_t token, const uint8_t* src) {
+// Send one block of data for write block or write multiple blocks
+bool Sd2Card::writeData(const uint8_t token, const uint8_t* src) {
 
-#if ENABLED(SD_CHECK_AND_RETRY)
-  uint16_t crc = CRC_CCITT( src, 512 );
-#else  // ENABLED(SD_CHECK_AND_RETRY)
-  uint16_t crc = 0xFFFF;
-#endif  // ENABLED(SD_CHECK_AND_RETRY)
-  spiSendBlock( token, src );
-  spiSend( crc >> 8 );
-  spiSend( crc & 0XFF );
+  uint16_t crc =
+    #if ENABLED(SD_CHECK_AND_RETRY)
+      CRC_CCITT(src, 512)
+    #else
+      0xFFFF
+    #endif
+  ;
+  spiSendBlock(token, src);
+  spiSend(crc >> 8);
+  spiSend(crc & 0xFF);
 
   status_ = spiRec();
   if ((status_ & DATA_RES_MASK) != DATA_RES_ACCEPTED) {
@@ -643,23 +624,18 @@ bool Sd2Card::writeData(uint8_t token, const uint8_t* src) {
  *
  * \return true for success, false for failure.
  */
-bool Sd2Card::writeStart(uint32_t blockNumber, uint32_t eraseCount) {
-  // send pre-erase count
-  if (cardAcmd(ACMD23, eraseCount)) {
-    error(SD_CARD_ERROR_ACMD23);
-    goto FAIL;
-  }
-  // use address if not SDHC card
-  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
-  if (cardCommand(CMD25, blockNumber)) {
-    error(SD_CARD_ERROR_CMD25);
-    goto FAIL;
+bool Sd2Card::writeStart(uint32_t blockNumber, const uint32_t eraseCount) {
+  bool success = false;
+  if (!cardAcmd(ACMD23, eraseCount)) {                    // Send pre-erase count
+    if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;   // Use address if not SDHC card
+    success = !cardCommand(CMD25, blockNumber);
+    if (!success) error(SD_CARD_ERROR_CMD25);
   }
+  else
+    error(SD_CARD_ERROR_ACMD23);
+
   chipDeselect();
-  return true;
-  FAIL:
-  chipDeselect();
-  return false;
+  return success;
 }
 
 /**
@@ -668,16 +644,17 @@ bool Sd2Card::writeStart(uint32_t blockNumber, uint32_t eraseCount) {
  * \return true for success, false for failure.
  */
 bool Sd2Card::writeStop() {
+  bool success = false;
   chipSelect();
-  if (!waitNotBusy(SD_WRITE_TIMEOUT)) goto FAIL;
-  spiSend(STOP_TRAN_TOKEN);
-  if (!waitNotBusy(SD_WRITE_TIMEOUT)) goto FAIL;
-  chipDeselect();
-  return true;
-  FAIL:
-  error(SD_CARD_ERROR_STOP_TRAN);
+  if (waitNotBusy(SD_WRITE_TIMEOUT)) {
+    spiSend(STOP_TRAN_TOKEN);
+    success = waitNotBusy(SD_WRITE_TIMEOUT);
+  }
+  else
+    error(SD_CARD_ERROR_STOP_TRAN);
+
   chipDeselect();
-  return false;
+  return success;
 }
 
 #endif // SDSUPPORT
diff --git a/Marlin/src/sd/Sd2Card.h b/Marlin/src/sd/Sd2Card.h
index 8f14073df..2701f65a4 100644
--- a/Marlin/src/sd/Sd2Card.h
+++ b/Marlin/src/sd/Sd2Card.h
@@ -112,7 +112,7 @@ uint8_t const SD_CARD_TYPE_SD1  = 1,                    // Standard capacity V1
  * \brief Raw access to SD and SDHC flash memory cards.
  */
 class Sd2Card {
-  public:
+public:
 
   Sd2Card() : errorCode_(SD_CARD_ERROR_INIT_NOT_CALLED), type_(0) {}
 
@@ -124,15 +124,15 @@ class Sd2Card {
    *  Set SD error code.
    *  \param[in] code value for error code.
    */
-  void error(uint8_t code) {errorCode_ = code;}
+  inline void error(const uint8_t code) { errorCode_ = code; }
 
   /**
    * \return error code for last error. See Sd2Card.h for a list of error codes.
    */
-  int errorCode() const {return errorCode_;}
+  inline int errorCode() const { return errorCode_; }
 
   /** \return error data for last error. */
-  int errorData() const {return status_;}
+  inline int errorData() const { return status_; }
 
   /**
    * Initialize an SD flash memory card with default clock rate and chip
@@ -140,8 +140,8 @@ class Sd2Card {
    *
    * \return true for success or false for failure.
    */
-  bool init(uint8_t sckRateID = SPI_FULL_SPEED,
-            pin_t chipSelectPin = SD_CHIP_SELECT_PIN);
+  bool init(const uint8_t sckRateID=SPI_FULL_SPEED, const pin_t chipSelectPin=SD_CHIP_SELECT_PIN);
+
   bool readBlock(uint32_t block, uint8_t* dst);
 
   /**
@@ -163,12 +163,13 @@ class Sd2Card {
    *
    * \return true for success or false for failure.
    */
-  bool readCSD(csd_t* csd) { return readRegister(CMD9, csd); }
+  inline bool readCSD(csd_t* csd) { return readRegister(CMD9, csd); }
 
   bool readData(uint8_t* dst);
   bool readStart(uint32_t blockNumber);
   bool readStop();
-  bool setSckRate(uint8_t sckRateID);
+  bool setSckRate(const uint8_t sckRateID);
+
   /**
    * Return the card type: SD V1, SD V2 or SDHC
    * \return 0 - SD V1, 1 - SD V2, or 3 - SDHC.
@@ -176,10 +177,10 @@ class Sd2Card {
   int type() const {return type_;}
   bool writeBlock(uint32_t blockNumber, const uint8_t* src);
   bool writeData(const uint8_t* src);
-  bool writeStart(uint32_t blockNumber, uint32_t eraseCount);
+  bool writeStart(uint32_t blockNumber, const uint32_t eraseCount);
   bool writeStop();
 
-  private:
+private:
   uint8_t chipSelectPin_,
           errorCode_,
           spiRate_,
@@ -187,17 +188,17 @@ class Sd2Card {
           type_;
 
   // private functions
-  uint8_t cardAcmd(uint8_t cmd, uint32_t arg) {
+  inline uint8_t cardAcmd(const uint8_t cmd, const uint32_t arg) {
     cardCommand(CMD55, 0);
     return cardCommand(cmd, arg);
   }
-  uint8_t cardCommand(uint8_t cmd, uint32_t arg);
+  uint8_t cardCommand(const uint8_t cmd, const uint32_t arg);
 
-  bool readData(uint8_t* dst, uint16_t count);
-  bool readRegister(uint8_t cmd, void* buf);
+  bool readData(uint8_t* dst, const uint16_t count);
+  bool readRegister(const uint8_t cmd, void* buf);
   void chipDeselect();
   void chipSelect();
-  void type(uint8_t value) { type_ = value; }
+  inline void type(const uint8_t value) { type_ = value; }
   bool waitNotBusy(const millis_t timeout_ms);
-  bool writeData(uint8_t token, const uint8_t* src);
+  bool writeData(const uint8_t token, const uint8_t* src);
 };
diff --git a/Marlin/src/sd/cardreader.cpp b/Marlin/src/sd/cardreader.cpp
index fb21aab81..c47bc03db 100644
--- a/Marlin/src/sd/cardreader.cpp
+++ b/Marlin/src/sd/cardreader.cpp
@@ -1022,7 +1022,7 @@ void CardReader::printingHasFinished() {
       presort();
     #endif
 
-    #if ENABLED(ULTRA_LCD) && ENABLED(LCD_SET_PROGRESS_MANUALLY)
+    #if (ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)) && ENABLED(LCD_SET_PROGRESS_MANUALLY)
       ui.progress_bar_percent = 0;
     #endif
 
diff --git a/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.cpp b/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.cpp
index f4fda4b3c..6cf6dd8c3 100644
--- a/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.cpp
+++ b/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.cpp
@@ -31,6 +31,10 @@
 
 #include "Sd2Card_FlashDrive.h"
 
+#if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
+  #include "../../lcd/ultralcd.h"
+#endif
+
 USB usb;
 BulkOnly bulk(&usb);
 
@@ -46,25 +50,27 @@ void Sd2Card::idle() {
 
   switch (state) {
     case USB_HOST_DELAY_INIT:
-      next_retry = millis() + 10000;
+      next_retry = millis() + 2000;
       state = USB_HOST_WAITING;
       break;
     case USB_HOST_WAITING:
       if (ELAPSED(millis(), next_retry)) {
-        next_retry = millis() + 10000;
+        next_retry = millis() + 2000;
         state = USB_HOST_UNINITIALIZED;
       }
       break;
     case USB_HOST_UNINITIALIZED:
-      SERIAL_ECHOLNPGM("Starting USB host");
+      SERIAL_ECHOPGM("Starting USB host...");
       if (!usb.start()) {
-        SERIAL_ECHOLNPGM("USB host failed to start. Will retry in 10 seconds.");
+        SERIAL_ECHOPGM(" Failed. Retrying in 2s.");
+        #if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
+          LCD_MESSAGEPGM("USB start failed");
+        #endif
         state = USB_HOST_DELAY_INIT;
       }
-      else {
-        SERIAL_ECHOLNPGM("USB host initialized");
+      else
         state = USB_HOST_INITIALIZED;
-      }
+      SERIAL_EOL();
       break;
     case USB_HOST_INITIALIZED:
       const uint8_t lastUsbTaskState = usb.getUsbTaskState();
@@ -91,10 +97,10 @@ void Sd2Card::idle() {
 // This is equivalent to polling the SD_DETECT when using SD cards.
 bool Sd2Card::isInserted() {
   return usb.getUsbTaskState() == USB_STATE_RUNNING;
-};
+}
 
 // Marlin calls this to initialize an SD card once it is inserted.
-bool Sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin) {
+bool Sd2Card::init(const uint8_t sckRateID/*=0*/, const pin_t chipSelectPin/*=SD_CHIP_SELECT_PIN*/) {
   if (!ready()) return false;
 
   if (!bulk.LUNIsGood(0)) {
@@ -121,7 +127,7 @@ uint32_t Sd2Card::cardSize() {
   #ifndef USB_DEBUG
     const uint32_t
   #endif
-  lun0_capacity = bulk.GetCapacity(0);
+      lun0_capacity = bulk.GetCapacity(0);
   return lun0_capacity;
 }
 
diff --git a/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.h b/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.h
index ee044a19b..b27715ee0 100644
--- a/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.h
+++ b/Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.h
@@ -32,7 +32,6 @@
  */
 //#define USB_DEBUG 1
 
-
 #include "../SdFatConfig.h"
 #include "../SdInfo.h"
 
@@ -61,11 +60,11 @@
 class Sd2Card {
   private:
 
-    typedef enum {
-      USB_HOST_DELAY_INIT,
-      USB_HOST_WAITING,
+    typedef enum : uint8_t {
       USB_HOST_UNINITIALIZED,
-      USB_HOST_INITIALIZED
+      USB_HOST_INITIALIZED,
+      USB_HOST_DELAY_INIT,
+      USB_HOST_WAITING
     } state_t;
 
     static state_t state;
@@ -75,21 +74,20 @@ class Sd2Card {
       uint32_t lun0_capacity;
     #endif
 
-    static inline bool ready() {return state == USB_HOST_INITIALIZED;}
+    static inline bool ready() { return state == USB_HOST_INITIALIZED; }
 
   public:
-    bool init(uint8_t sckRateID = 0, uint8_t chipSelectPin = SD_CHIP_SELECT_PIN);
+    bool init(const uint8_t sckRateID=0, const pin_t chipSelectPin=SD_CHIP_SELECT_PIN);
 
     static void idle();
 
-    bool readStart(uint32_t block)                       { pos = block; return ready(); }
-    bool readData(uint8_t* dst)                          { return readBlock(pos++, dst); }
-    bool readStop()                                      { return true; }
-
-    bool writeStart(uint32_t block, uint32_t eraseCount) { pos = block; return ready(); }
-    bool writeData(uint8_t* src)                         { return writeBlock(pos++, src); }
-    bool writeStop()                                     { return true; }
+    inline bool readStart(const uint32_t block)                             { pos = block; return ready(); }
+    inline bool readData(uint8_t* dst)                                      { return readBlock(pos++, dst); }
+    inline bool readStop() const                                            { return true; }
 
+    inline bool writeStart(const uint32_t block, const uint32_t eraseCount) { UNUSED(eraseCount); pos = block; return ready(); }
+    inline bool writeData(uint8_t* src)                                     { return writeBlock(pos++, src); }
+    inline bool writeStop() const                                           { return true; }
 
     bool readBlock(uint32_t block, uint8_t* dst);
     bool writeBlock(uint32_t blockNumber, const uint8_t* src);