diff --git a/marlin_changes/HAL_stm32.h b/marlin_changes/HAL_stm32.h
index 69430c2..b05d6e5 100644
--- a/marlin_changes/HAL_stm32.h
+++ b/marlin_changes/HAL_stm32.h
@@ -360,7 +360,7 @@ void loop(void);
 // code (~500 bytes), there is no harm in always selecting this option on
 // the off chance that the extra fan output is available.
 //
-#define CONFIGURE_FAN1_AND_EXTRA_IO  1
+#define CONFIGURE_FAN1_AND_EXTRA_IO  0
 
 
 // must match pin description file, pins_MALYAN_M300.h
diff --git a/marlin_changes/MarlinSerial_stm32.cpp b/marlin_changes/MarlinSerial_stm32.cpp
index bbbb174..51b6b3c 100644
--- a/marlin_changes/MarlinSerial_stm32.cpp
+++ b/marlin_changes/MarlinSerial_stm32.cpp
@@ -41,6 +41,7 @@
 // custom serial
 #define CS_PACING_TX  0  // (ms) tx (blocking) wait if buffer is full
 #define QTIMER_DELAY  0  // (ms) idle time before flushing tx buffer
+#define USE_USART2    1  // Enable USART2 on PA2/PA3 instead of USB for communication
 
 #if MB(MALYAN_M300)
 extern CustomSerial Serial1;