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B550-E Gaming issue

Dodik
Level 7
Hello gyus, have question about bios flashback...
Basically i need to downgrade bios version to 1.0.0.4 from the last bios, i was see that bios flashback can downgrade the bios version, but it doesnt want to work on my board in any varients
(I tried to do a lot.. another usb, cleaning it with rufus etc. with diskpart clean, put out all usb adapters, network etc, clear cmos, but flashback wont work..any method led to blink the diod for 5 second and then stuck in static light)
Tell me what im do wrong?
maybe I don't know some tricks?
But the general question is bios downgrade, did flashback really can do this or i need another method?if not, which method i need to try for downgrade?
Thx a lot
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Dodik
Level 7
try to flash older bios with this instruction
https://www.youtube.com/watch?v=DwJS8-GTgRU
but i see error when flashing "error rom file size does not match existing bios size"
googling and understand that afudos cant flash bios more then 16mb, my bios have 32mb..
can someone tell me another methods please???