diff --git a/packages/stm32duino/hardware/STM32F1/2022.9.26/libraries/USBComposite/USBCompositeSerial.cpp b/packages/stm32duino/hardware/STM32F1/2022.9.26/libraries/USBComposite/USBCompositeSerial.cpp
index 08349a7..c3ab02f 100644
--- a/packages/stm32duino/hardware/STM32F1/2022.9.26/libraries/USBComposite/USBCompositeSerial.cpp
+++ b/packages/stm32duino/hardware/STM32F1/2022.9.26/libraries/USBComposite/USBCompositeSerial.cpp
@@ -22,7 +22,7 @@
 #include <libmaple/usb.h>
 #include <string.h>
 #include <libmaple/iwdg.h>
-
+#include <libmaple/bkp.h>
 #include "usb_composite_serial.h"
 
 #define USB_TIMEOUT 50
@@ -208,6 +208,10 @@ static void ifaceSetupHook(unsigned hook, void *requestvp) {
 
 #define RESET_DELAY 100000
 static void wait_reset(void) {
+  bkp_init();
+  bkp_enable_writes();
+  bkp_write(10, 0x424C);
+  bkp_disable_writes();
   delay_us(RESET_DELAY);
   nvic_sys_reset();
 }