Update BootloaderCDC.c

Bootloaders/CDC/BootloaderCDC.c

@@ -156,6 +156,9 @@ int main(void)
 		CDC_Task();
 		USB_USBTask();
 	}
+	
+	/* Wait a short time to end all USB transactions and then disconnect */
+	_delay_us(1000);
 
 	/* Disconnect from the host - USB interface will be reset later along with the AVR */
 	USB_Detach();