Is it possible to flash a PRIME B550M-K bios to a RIME B450M-A?

1 : Anonymous2021/10/25 12:35 ID: qffqbq

to re-enable PCIe 4.0 ? they both look the same. (bios) at least x1 PCIe 4.0 x8 ? (or asrock b550m/ac bios?) edit. looks fine

edit. lol down-votes. why so angry?

2 : Anonymous2021/10/25 14:16 ID: hhzke5q

I crossflashed my ASRock B350 Gaming K4 to the equivalent B450 Gaming K4 to get Zen3 and SAM support -- everything works just fine.

It works on ASRock boards because some board iterations (B350 and B450 for example) are virtually the same... same fan header configurations, same 16MB SPI size, etc.

I'm not sure about ASUS specifically, you need to check forums for more insight.

Refer to this thread for flashing the actual BIOS, since you'll have to bypass the compatibility check with flashrom (also reddit thread for reference).

Also keep in mind that if you fuck anything up, you'll need an SPI programmer to unbrick your mobo.

ID: hhzytu4

Think I can get a ab350m or b350 bazooka to take a 5600x?

ID: hi1n0xk

Interesting. The B450 version of my B350 board is practically the same, so I feel it'd work ok for me. I won't do it though, at least not anytime soon.

3 : Anonymous2021/10/25 14:10 ID: hhzjmi7

No, don't do this, this will most likely render your mobo inoperable.

What you could do is extract AGESA firmware from BIOS images and incorporate in other images. Maybe try some from mobo with B550A chipset (those were OEM-only variants of the original Promontory chipset without PCIe 4.0 inhibitor) and put it in your B450 BIOS. But do it only if you understand the risks and are prepared to recover from bad BIOS flash.

ID: hhzqyxh

cool, will look into this, thanks

4 : Anonymous2021/10/25 15:13 ID: hhzs8vz

possible but you'll have a paperweight after.

is there any reason for enabling pcie4 on a non pcie4 validated board, if you are going to try put an NVME on id be cautious of data corruption because how are you going to validate the bus and port work as expected. b550 and b450 are quite different vs b450 and b350

ID: hhzv37u

might use a crappy 6600xt.. or not

5 : Anonymous2021/10/25 16:51 ID: hi06hdx

Florida Man always doing good things for PC, very informative post OP.

6 : Anonymous2021/10/25 13:08 ID: hhzc1il

No and trying to do so will likely brick the board at worst or tell you to GTFO when you try.

Pretty sure the bios flashing tool will throw a fit and reject the attempt.

They removed PCIe 4 from 400 series boards because they were never built to handle the higher signal integrity required for PCIe 4 to function correctly.

ID: hhzcbjz

last bios also almost bricked my board, so im not really afraid to try. btw old bios had full pcie 4.0 support.

ID: hhzcvlt

Yes had support .. doesnt mean a damn thing since we all know just how well it functioned a car with its check engine light on and warranty ending in 30 mins. (Work partially till it didn't and had people bitching on here about it)

but hey its your board so give it a go and report back .. for science.

7 : Anonymous2021/10/25 13:18 ID: hhzd672

NO. You will brick your motherboard

ID: hhzdro0

mmm, 5600x working fine with this board... maybe i should downgrade my bios then


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