As I wrote you in private (repeating it here so if anybody gets in the same problem, knows / has_confirmation about what is the solution), it's fixed, using the same file that (via Windows 10) had bricked it. So it was not the file (AM01_102A_720.bin) the problem, but the Windows flasher.
I bought and used a CH341A and the 1.8V converter (the 2nd, as the 1st was defective) but in the end it worked.
By the way, there's now also a new version of the CH341A (v1.7, but v1.6 does the same too) that lets you select (via a physical switch) 1.8V 2.5V 3.3V 5V that is much better than the classic CH341A plus the 1.8V adapter (even the 2nd I had to purchase
), much higher quality too, but is available only on AliExpress actually.
On a side note, in my VOYO V1 VMac Mini PC there was a Macronix MX25U6435F instead of the usual Winbond W25Q64FWSIG. They're both 1.8V but not sure if they use the same identical protocol or not, however, I used the software NeoProgrammer V2.2.0.10 (which is the evolution / new name of AsProgrammer) and it worked flawless first attempt.
I hope my infos will be useful to anyone someday (even outside of the VMac Mini, i.e. the new CH341A v1.7 is way better than the black edition, and that NeoProgrammer is the new best software out there for these devices).
Thanks again for your support.
Cheers!