diff --git a/Marlin/src/HAL/STM32/sdio.cpp b/Marlin/src/HAL/STM32/sdio.cpp
index 41fe90b825..72518ef1cc 100644
--- a/Marlin/src/HAL/STM32/sdio.cpp
+++ b/Marlin/src/HAL/STM32/sdio.cpp
@@ -286,6 +286,9 @@ void HAL_SD_MspInit(SD_HandleTypeDef *hsd) {
 
     go_to_transfer_speed();
 
+    hsd.Init.ClockPowerSave = SDIO_CLOCK_POWER_SAVE_ENABLE;
+    hsd.Init.ClockDiv = 8;
+
     #if PINS_EXIST(SDIO_D1, SDIO_D2, SDIO_D3) // go to 4 bit wide mode if pins are defined
       retry_Cnt = retryCnt;
       for (;;) {
@@ -433,7 +436,10 @@ bool SDIO_WriteBlock(uint32_t block, const uint8_t *src) {
   #else
 
     uint8_t retries = SDIO_READ_RETRIES;
-    while (retries--) if (SDIO_ReadWriteBlock_DMA(block, src, nullptr)) return true;
+    while (retries--) {
+      if (SDIO_ReadWriteBlock_DMA(block, src, nullptr)) return true;
+      delay(10);
+    }
     return false;
 
   #endif
diff --git a/Marlin/src/feature/stepper_driver_safety.cpp b/Marlin/src/feature/stepper_driver_safety.cpp
index b8762da9b0..d3fc161486 100644
--- a/Marlin/src/feature/stepper_driver_safety.cpp
+++ b/Marlin/src/feature/stepper_driver_safety.cpp
@@ -43,7 +43,7 @@ void stepper_driver_backward_check() {
       SET_INPUT(AXIS##_ENABLE_PIN); \
       OUT_WRITE(AXIS##_STEP_PIN, false); \
       delay(20); \
-      if (READ(AXIS##_ENABLE_PIN) == false) { \
+      if (READ(AXIS##_ENABLE_PIN) == LOW) { \
         SBI(axis_plug_backward, BIT); \
         stepper_driver_backward_error(F(STRINGIFY(AXIS))); \
       } \
diff --git a/Marlin/src/gcode/config/M220.cpp b/Marlin/src/gcode/config/M220.cpp
index c9070df803..6797df25d5 100644
--- a/Marlin/src/gcode/config/M220.cpp
+++ b/Marlin/src/gcode/config/M220.cpp
@@ -36,16 +36,15 @@
  *   R : Flag to restore the last-saved factor
  */
 void GcodeSuite::M220() {
+  if (!parser.seen_any()) {
+    SERIAL_ECHOLNPGM("FR:", feedrate_percentage, "%");
+    return;
+  }
 
   static int16_t backup_feedrate_percentage = 100;
-  if (parser.seen('B')) backup_feedrate_percentage = feedrate_percentage;
-  if (parser.seen('R')) feedrate_percentage = backup_feedrate_percentage;
-
+  const int16_t now_feedrate_perc = feedrate_percentage;
+  if (parser.seen_test('R')) feedrate_percentage = backup_feedrate_percentage;
+  if (parser.seen_test('B')) backup_feedrate_percentage = now_feedrate_perc;
   if (parser.seenval('S')) feedrate_percentage = parser.value_int();
 
-  if (!parser.seen_any()) {
-    SERIAL_ECHOPGM("FR:", feedrate_percentage);
-    SERIAL_CHAR('%');
-    SERIAL_EOL();
-  }
 }
diff --git a/Marlin/src/sd/usb_flashdrive/lib-uhs2/settings.h b/Marlin/src/sd/usb_flashdrive/lib-uhs2/settings.h
index 7ce7b5e6ba..268c0e1d1d 100644
--- a/Marlin/src/sd/usb_flashdrive/lib-uhs2/settings.h
+++ b/Marlin/src/sd/usb_flashdrive/lib-uhs2/settings.h
@@ -65,12 +65,12 @@
  * multiple serial ports are available.
  * For example Serial3.
  */
-#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-  #define USB_HOST_SERIAL MYSERIAL1
-#endif
-
 #ifndef USB_HOST_SERIAL
-  #define USB_HOST_SERIAL Serial
+  #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
+    #define USB_HOST_SERIAL MYSERIAL1
+  #else
+    #define USB_HOST_SERIAL Serial
+  #endif
 #endif
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/docs/Serial.md b/docs/Serial.md
index be3b23e87d..88846e1bb4 100644
--- a/docs/Serial.md
+++ b/docs/Serial.md
@@ -64,9 +64,9 @@ The following macros are defined (in `serial.h`) to output data to the serial po
 | `SERIAL_ECHOLNPGM_P` | Same as `SERIAL_ECHOPGM_P` | Do `SERIAL_ECHOPGM_P`, adding a newline | `SERIAL_ECHOLNPGM_P(PSTR("Alice"), 78);` | `alice78\n` |
 | `SERIAL_ECHOLIST` | String literal, values | Print a string literal and a list of values | `SERIAL_ECHOLIST(F("Key "), 1, 2, 3);` | `Key 1, 2, 3` |
 | `SERIAL_ECHO_START` | None | Prefix an echo line | `SERIAL_ECHO_START();` | `echo:` |
-| `SERIAL_ECHO_MSG` | Same as `SERIAL_ECHOLN_PAIR` | Print a full echo line | `SERIAL_ECHO_MSG("Count is ", count);` | `echo:Count is 3` |
+| `SERIAL_ECHO_MSG` | Same as `SERIAL_ECHOLNPGM` | Print a full echo line | `SERIAL_ECHO_MSG("Count is ", count);` | `echo:Count is 3` |
 | `SERIAL_ERROR_START`| None | Prefix an error line | `SERIAL_ERROR_START();` | `Error:` |
-| `SERIAL_ERROR_MSG` | Same as `SERIAL_ECHOLN_PAIR` | Print a full error line | `SERIAL_ERROR_MSG("Not found");` | `Error:Not found` |
+| `SERIAL_ERROR_MSG` | Same as `SERIAL_ECHOLNPGM` | Print a full error line | `SERIAL_ERROR_MSG("Not found");` | `Error:Not found` |
 | `SERIAL_ECHO_SP` | Number of spaces | Print one or more spaces | `SERIAL_ECHO_SP(3)` | `   ` |
 | `SERIAL_EOL` | None | Print an end of line | `SERIAL_EOL();` | `\n` |
 | `SERIAL_OUT` | `SERIAL_OUT(myMethod)` | Call a custom serial method | `SERIAL_OUT(msgDone);` | ... |