diff --git a/Marlin/src/HAL/STM32F1/HAL.h b/Marlin/src/HAL/STM32F1/HAL.h
index 81c368db2b5b3..0506ceb3da24e 100644
--- a/Marlin/src/HAL/STM32F1/HAL.h
+++ b/Marlin/src/HAL/STM32F1/HAL.h
@@ -109,8 +109,9 @@
   #else
     #error "LCD_SERIAL_PORT must be -1 or from 1 to 3. Please update your configuration."
   #endif
-
-  #define SERIAL_GET_TX_BUFFER_FREE() LCD_SERIAL.availableForWrite()
+  #if HAS_DGUS_LCD
+    #define SERIAL_GET_TX_BUFFER_FREE() LCD_SERIAL.availableForWrite()
+  #endif
 #endif
 
 // Set interrupt grouping for this MCU
diff --git a/Marlin/src/inc/Conditionals_LCD.h b/Marlin/src/inc/Conditionals_LCD.h
index 842c6cc4ea9fb..2caa5ab942a20 100644
--- a/Marlin/src/inc/Conditionals_LCD.h
+++ b/Marlin/src/inc/Conditionals_LCD.h
@@ -667,6 +667,9 @@
 
 #if ENABLED(DWIN_CREALITY_LCD)
   #define SERIAL_CATCHALL 0
+  #ifndef LCD_SERIAL_PORT
+    #define LCD_SERIAL_PORT 3 // Creality 4.x board
+  #endif
 #endif
 
 /**
diff --git a/Marlin/src/lcd/dwin/dwin_lcd.cpp b/Marlin/src/lcd/dwin/dwin_lcd.cpp
index 7d1528bed19bd..1978c6a4f801c 100644
--- a/Marlin/src/lcd/dwin/dwin_lcd.cpp
+++ b/Marlin/src/lcd/dwin/dwin_lcd.cpp
@@ -82,20 +82,27 @@ inline void DWIN_String(size_t &i, const __FlashStringHelper * string) {
 // Send the data in the buffer and the packet end
 inline void DWIN_Send(size_t &i) {
   ++i;
-  LOOP_L_N(n, i) { MYSERIAL1.write(DWIN_SendBuf[n]); delayMicroseconds(1); }
-  LOOP_L_N(n, 4) { MYSERIAL1.write(DWIN_BufTail[n]); delayMicroseconds(1); }
+  LOOP_L_N(n, i) { LCD_SERIAL.write(DWIN_SendBuf[n]); delayMicroseconds(1); }
+  LOOP_L_N(n, 4) { LCD_SERIAL.write(DWIN_BufTail[n]); delayMicroseconds(1); }
 }
 
 /*-------------------------------------- System variable function --------------------------------------*/
 
 // Handshake (1: Success, 0: Fail)
 bool DWIN_Handshake(void) {
+  #ifndef LCD_BAUDRATE
+    #define LCD_BAUDRATE 115200
+  #endif
+  LCD_SERIAL.begin(LCD_BAUDRATE);
+  const millis_t serial_connect_timeout = millis() + 1000UL;
+  while (!LCD_SERIAL && PENDING(millis(), serial_connect_timeout)) { /*nada*/ }
+
   size_t i = 0;
   DWIN_Byte(i, 0x00);
   DWIN_Send(i);
 
-  while (MYSERIAL1.available() > 0 && recnum < (signed)sizeof(databuf)) {
-    databuf[recnum] = MYSERIAL1.read();
+  while (LCD_SERIAL.available() > 0 && recnum < (signed)sizeof(databuf)) {
+    databuf[recnum] = LCD_SERIAL.read();
     // ignore the invalid data
     if (databuf[0] != FHONE) { // prevent the program from running.
       if (recnum > 0) {
diff --git a/Marlin/src/lcd/dwin/e3v2/dwin.cpp b/Marlin/src/lcd/dwin/e3v2/dwin.cpp
index bab5487601b33..2cccded303aea 100644
--- a/Marlin/src/lcd/dwin/e3v2/dwin.cpp
+++ b/Marlin/src/lcd/dwin/e3v2/dwin.cpp
@@ -497,14 +497,21 @@ inline void Draw_Back_First(const bool is_sel=true) {
   if (is_sel) Draw_Menu_Cursor(0);
 }
 
-inline bool Apply_Encoder(const ENCODER_DiffState &encoder_diffState, auto &valref) {
-  if (encoder_diffState == ENCODER_DIFF_CW)
-    valref += EncoderRate.encoderMoveValue;
-  else if (encoder_diffState == ENCODER_DIFF_CCW)
-    valref -= EncoderRate.encoderMoveValue;
-  else if (encoder_diffState == ENCODER_DIFF_ENTER)
-    return true;
+#define APPLY_ENCODER_F \
+  if (encoder_diffState == ENCODER_DIFF_CW)          \
+    valref += EncoderRate.encoderMoveValue;          \
+  else if (encoder_diffState == ENCODER_DIFF_CCW)    \
+    valref -= EncoderRate.encoderMoveValue;          \
+  else if (encoder_diffState == ENCODER_DIFF_ENTER)  \
+    return true;                                     \
   return false;
+
+inline bool Apply_Encoder(const ENCODER_DiffState &encoder_diffState, int16_t &valref) {
+  APPLY_ENCODER_F
+}
+
+inline bool Apply_Encoder(const ENCODER_DiffState &encoder_diffState, float &valref) {
+  APPLY_ENCODER_F
 }
 
 //
diff --git a/Marlin/src/lcd/dwin/e3v2/dwin.h b/Marlin/src/lcd/dwin/e3v2/dwin.h
index 8f17c30609830..80bc93dcc5a23 100644
--- a/Marlin/src/lcd/dwin/e3v2/dwin.h
+++ b/Marlin/src/lcd/dwin/e3v2/dwin.h
@@ -249,7 +249,8 @@ typedef struct {
     float Move_E_scale    = 0;
   #endif
   float offset_value      = 0;
-  char show_mode          = 0;    // -1: Temperature control    0: Printing temperature
+  TERN_(__STM32F1__, signed)
+  char show_mode          = 0; // -1: Temperature control    0: Printing temperature
 } HMI_value_t;
 
 #define DWIN_CHINESE 123
diff --git a/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.cpp b/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.cpp
index efbc57e68a80d..ab6067caeb0e1 100644
--- a/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.cpp
+++ b/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.cpp
@@ -592,15 +592,12 @@ void AnycubicTFTClass::GetCommandFromTFT() {
           } break;
 
           case 5: { // A5 GET CURRENT COORDINATE
-            float xPostition = ExtUI::getAxisPosition_mm(ExtUI::X);
-            float yPostition = ExtUI::getAxisPosition_mm(ExtUI::Y);
-            float zPostition = ExtUI::getAxisPosition_mm(ExtUI::Z);
-            SEND_PGM("A5V X: ");
-            LCD_SERIAL.print(xPostition);
-            SEND_PGM(" Y: ");
-            LCD_SERIAL.print(yPostition);
-            SEND_PGM(" Z: ");
-            LCD_SERIAL.print(zPostition);
+            const float xPosition = ExtUI::getAxisPosition_mm(ExtUI::X),
+                        yPosition = ExtUI::getAxisPosition_mm(ExtUI::Y),
+                        zPosition = ExtUI::getAxisPosition_mm(ExtUI::Z);
+            SEND_PGM("A5V X: "); LCD_SERIAL.print(xPosition);
+            SEND_PGM(   " Y: "); LCD_SERIAL.print(yPosition);
+            SEND_PGM(   " Z: "); LCD_SERIAL.print(zPosition);
             SENDLINE_PGM("");
           } break;