diff --git a/F0:F030,F042,F072/usbcan_ringbuffer/can.c b/F0:F030,F042,F072/usbcan_ringbuffer/can.c
index 694e96a..108ca3f 100644
--- a/F0:F030,F042,F072/usbcan_ringbuffer/can.c
+++ b/F0:F030,F042,F072/usbcan_ringbuffer/can.c
@@ -372,7 +372,7 @@ static void can_process_fifo(uint8_t fifo_num){
             }
         }
         if(CAN_messagebuf_push(&msg)) return; // error: buffer is full, try later
-        *RFxR |= CAN_RF0R_RFOM0; // release fifo for access to next message
+        *RFxR = CAN_RF0R_RFOM0; // release fifo for access to next message
     }
     //if(*RFxR & CAN_RF0R_FULL0) *RFxR &= ~CAN_RF0R_FULL0;
     *RFxR = 0; // clear FOVR & FULL
@@ -380,11 +380,11 @@ static void can_process_fifo(uint8_t fifo_num){
 
 void cec_can_isr(){
     if(CAN->RF0R & CAN_RF0R_FOVR0){ // FIFO overrun
-        CAN->RF0R &= ~CAN_RF0R_FOVR0;
+        CAN->RF0R = CAN_RF0R_FOVR0;
         can_status = CAN_FIFO_OVERRUN;
     }
     if(CAN->RF1R & CAN_RF1R_FOVR1){
-        CAN->RF1R &= ~CAN_RF1R_FOVR1;
+        CAN->RF1R = CAN_RF1R_FOVR1;
         can_status = CAN_FIFO_OVERRUN;
     }
     if(CAN->MSR & CAN_MSR_ERRI){ // Error
diff --git a/F0:F030,F042,F072/usbcan_ringbuffer/usbcan.bin b/F0:F030,F042,F072/usbcan_ringbuffer/usbcan.bin
index 3fe74fe..2f09925 100755
Binary files a/F0:F030,F042,F072/usbcan_ringbuffer/usbcan.bin and b/F0:F030,F042,F072/usbcan_ringbuffer/usbcan.bin differ
diff --git a/F0:F030,F042,F072/usbcan_ringbuffer/version.inc b/F0:F030,F042,F072/usbcan_ringbuffer/version.inc
index cf20f39..b735266 100644
--- a/F0:F030,F042,F072/usbcan_ringbuffer/version.inc
+++ b/F0:F030,F042,F072/usbcan_ringbuffer/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "49"
-#define BUILD_DATE "2024-09-02"
+#define BUILD_NUMBER "50"
+#define BUILD_DATE "2024-11-18"
diff --git a/makefile.stm32 b/makefile.stm32
index 207b3c7..df54127 100644
--- a/makefile.stm32
+++ b/makefile.stm32
@@ -158,7 +158,7 @@ clean:
 
 flash: $(BIN)
 	@echo "  FLASH  $(BIN)"
-	$(STFLASH) write $(BIN) 0x8000000
+	$(STFLASH) --reset write $(BIN) 0x8000000
 	$(STFLASH) reset
 
 boot: $(BIN)