If he formatted the computer and it still isn’t working I’d say it’s more of a USB issue with hardware than a USB issue with Windows. Are you using the USB ports attached to the motherboard or the ones on front panel? You said you screwed up a bios flash, I’m assuming that’s on a different PC? I’m going to go with power issue/USB hardware malfunction. Try uninstalling all the universal serial bus controllers in device manager and restarting your computer. This will force it to reinstall everything. I still think it’s hardware.
