Hello,
I’ve got the black golden “CH341A Pro” mini programmer, too.
Could read to my BIOS chip Winbond W25Q32V in parallel USB mode without any problem. The W25Q32V is be a 3.3V-BIOS (2.9V - 3.7V).
So I had no problem & no need to do the 3.3V mod. Proofed with analog voltmeter tool.
Maybe newer versions of CH341A black/gold or generally some of that versions could work at 3.3V and some not.
Or am I thinking wrong? Is the problem somewhere else? I have 3.3V @ chip 25xx pin 7, 11, 12 … and chip 24xx pin 16, if you look on the shematics picture.
Anyway here’re photos how to do the 3.3VoltageMod on CH341A black/gold version, if needed:
Best regards, MiMo