When I try to run the "Genuine check" - I unlock the Ledger, but nothing happens. The Ledger Live asks if I have a hard time connecting, and there is a button for "Repair". When I try to follow the "Repair your Ledger device" procedure. It all stops when I try to load the bootloader. The Ledger displays "Bootloader" in the display, but then nothing more happens.
There could be a several things causing such a behaviour. Try using a different USB cable or a different PC (if possible). Also, what version of Ledger Live do you have? You can check it the Settings -> About.