the fix is only needed because some chips can be damaged by the 5Volts to the inputs.i got my CH341A not even needed to do the 3.3v fix
Apparently for some electronics engineer it's not really needed because the current is really really low, so the mix of the two is not enough to kill a chip, but maybe i'm wrong, look : (2) How to program a bios chip - CH341A programmer - YouTubethe fix is only needed because some chips can be damaged by the 5Volts to the inputs.
no clueIf it's useful, do you have the bios file to update it ?