Radeon R9 Nano BIOS flashing tools not working

[3x0]

Hi, I have a R9 Nano that has a problematic primary BIOS- when it's selected the card is very unstable even on desktop. When I switch to the secondary BIOS the card is working properly.

The primary BIOS version is the UEFI compliant version 015.049.000.012.006449 (read by GPUz) https://www.techpowerup.com/vgabios/183161/amd-r9nano-4096-160212
The secondary, working BIOS is 015.049.000.008.006197 (non-UEFI)

I'd like to flash the primary BIOS with a working one, but every version of AtiFlash/AtiWinFlash/AMDVBFlash either don't run or don't recognize the card. I can't even read any of the two BIOSes. I'm running Windows 10 64bit with 22.6.1 drivers.

Does anyone know which BIOS flasher version to use?

 

[INSTG8R]

I had a Fury that I flashed to a full Fury X but I did that by modifying the original BIOS. If I recall correctly they won’t flash to another BIOS they had some sort of write protection/hash key. Now this was obviously years ago now so I will tag the only man I trust that would know bette. I’m retired @eidairaman1 hopefully I’m wrong here and you m know how to help.

 

[3x0]

I've tried some more versions and amdvbflash_win_3.31 works without issues. Unfortunately the BIOS chip itself seems faulty:
-reflashed the UEFI compliant version 015.049.000.008.006197, the problems persisted but it would crash less often
-flashed an older version, crashes still there but at least I could run 3D load for a few seconds
-flashed the BIOS that I've saved from the second slot- the card was stable completely, at least for 5 minutes under load
-flashed the UEFI compliant version 015.049.000.008.006197 again, the card seems to be working, currently testing

So it seems the chip itself it "rotten", and needed a few program/erase cycles to work again. Now I don't know whether I should trust it or just flip to the secondary BIOS permanently.

 

[eidairaman1]

I had a Fury that I flashed to a full Fury X but I did that by modifying the original BIOS. If I recall correctly they won’t flash to another BIOS they had some sort of write protection/hash key. Now this was obviously years ago now so I will tag the only man I trust that would know bette. I’m retired @eidairaman1 hopefully I’m wrong here and you m know how to help.

Boot up on working bios, flip switch to non working bios,

Install the driver from latest version of amdvbflash which should disable write protection, attempt to use 2.93 or 2.93+

Otherwise might need to do the 1+8 or 1+5 pin shorting method. Or get a spi flasher.

I've tried some more versions and amdvbflash_win_3.31 works without issues. Unfortunately the BIOS chip itself seems faulty:
-reflashed the UEFI compliant version 015.049.000.008.006197, the problems persisted but it would crash less often
-flashed an older version, crashes still there but at least I could run 3D load for a few seconds
-flashed the BIOS that I've saved from the second slot- the card was stable completely, at least for 5 minutes under load
-flashed the UEFI compliant version 015.049.000.008.006197 again, the card seems to be working, currently testing

So it seems the chip itself it "rotten", and needed a few program/erase cycles to work again. Now I don't know whether I should trust it or just flip to the secondary BIOS permanently.

Continue to test, if it stops flip to other side, who knows might need to secure another firmware chip

@3x0 here is additional guidance

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