Help!!! My Midi Fighter Classic does not work!

Help!!! My Midi Fighter Classic does not work!

My Midi Fighter Classic doesn’t work suddenly.
I tried this guide, but it was unsuccessful.

Perhaps, it has become in bootloader mode, but I can’t firmware update:disappointed:

Check out this video.

What should I do?
Somebody please help me!

P.S.
Sorry I’m not good in English…:open_mouth: