Originally Posted by Baio73
WELL DONE AMD!
I own a X570 board, so I was not directly envolved, but I think they took the right decision for the brand's reputation.
I just can't understand why upgrading the BIOS to the Zen3 compatible version should be a no-return action... can't think of any technical reason, and do think about many marketing reasons, as this means you won't be able to sell your mobo as used to people with a Zen - Zen+ - Zen2 CPUs...
100 Percent Agree!
And, I think I know the reason they are not supporting a return to the older bios. I don't believe they made this decision for those of us with 32MB Roms, because our CPU's will be able to support the 3000 Series and the 4000 Series, so for us flashing back won't be an issue. But I believe they don't want to confuse the situation, so they are just saying plain and simple that once you flash forward, you won't be able to flash back, giving people the expectation that they can only go one way.
The Reason for this is that there will be a bunch of 16MB Rom boards on the 400 Series (There are way more 16MB Rom Boards then there are 32MB Rom Boards) And for a good portion of these boards, they won't be able to fit the code for the Older and the Newer CPU's in the Rom, so for this reason they only want to support the one way jump, they can build in code to make the transition easier, so if you have a 3000 Series Chip, and then you flash forward to the 4000 Series chip, once the flashing is done they can build in some type of message on boot that will say that the flash was successful and to go ahead and swap the chips. However going from the New Bios to the Old, that Code will not be there, and they are afraid that a lot of people will bork the process, so they just don't want to support it at all. It does make sense when you think of it from that perspective.
However, with all that being said. For those of us with BIOS Flashback, it won't matter, we could use BIOS Flashback to flash to the Older Bios and it will almost certainly work.
However, if they put in code to actively block us from Flashing from the New Firmware to the old, then all we will have to do is use an EEPROM Reader/Writer to Completely Erase the CMOS Ourselves, and then write the Older Bios to the CMOS. This will 100 Percent work, so for anyone who does want to sell a Board and make it compatible with an Older CPU, this is absolutely a way to do it, no matter what AMD decides to block, just look up EEPROM Reader, do your research, and you will get through it. Either that or Ask me, I will help you through it, this is the same process I use to Unbrick boards that have had bad flashes all the time.