diff --git a/Core/Src/stm32_lpm_if.c b/Core/Src/stm32_lpm_if.c
index ec02912..a04384d 100644
--- a/Core/Src/stm32_lpm_if.c
+++ b/Core/Src/stm32_lpm_if.c
@@ -83,7 +83,9 @@ void PWR_EnterOffMode(void)
 #if 1
 	//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_RESET); /* LED OFF */
 	  HAL_SuspendTick();
+	  HAL_UART_DeInit(&huart2);
 	  LL_PWR_ClearFlag_WU();
+	  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
 	  HAL_PWR_EnterSTANDBYMode();
 #endif