Hello. When flashing it is important to charge the batteries and use the laptop then there will be less problems. Try updating again by turning on boot mode by holding down the F1 key and pressing the power button. If it does not help, then just flashing through the programmer directly. I didn’t write in more detail because if not skillful actions can damage the device, it is used for programming STM ST-Link Utility
Post time 2019-3-6 01:41:29