Mitrabrate, read the initial post and read the thread, you’re doing the opposite of what is recommended vega 64 → vega 56 bios not the other way around. Leave you vega 56 cards with original bios. All your ref cards can be flashed from hiveos with this bios:
016.001.001.000.008771
Also read this thread
Vega 64 - 54MH/s with less than 130w
ALL SAMSUNG REF CARDS CAN ACHIEVE 55+mhs ethash EZ TEBRAAAA