BG2GFC Thank you for your response. I have already updated them on the forum, and I believe the handheld device is correctly in DFU mode (the top indicator light flashes red and green alternately, and the display turns off). However, it still shows the following:

It seems there's no driver; how can I flash a new one?
These are some of the files I have obtained so far.

My computer has Windows 10.