All of the above is not completely correct.
The way you actually factory reset one of these is you hold down FX2 and FX3 then SAVE, then you switch off the Amp, then switch it back on.
Its worked for me, because its fixed a muffling problem.
I have the same issue on Windows 11 (Development Preview) with a V20 MKII
EDIT: Your AMP must be connected by mUSB (Micro USB) to your PC, on mine, it does not have a switch to switch O.S. its detecting.