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how to fix bad 5850 bios flash

post #1 of 7
Thread Starter 
I have 2 5850s in crossfire, one Gigabyte and one XFX. I wanted to increase the upper limits for the core clock so I saved the signature file from an Asus 5850 with RBE and then loaded it onto an original bios for my XFX card and flashed it through RBE with winflash. I did not touch the Gigabyte card. When I try to start my computer with the XFX card in it I get a BSOD right before Windows starts. I have used RBE quite a bit in the past, and I have done the trick with the sig. file a few times. I don't think it should have bricked the card so I suspect it was a bad bios flash. Can anyone please give me a good tutorial on how to use my USB drive and DOS to flash the XFX card using the Gigabyte one? I can't find a decent guide on how to do this anywhere. +1 rep to anyone who helps me fix it. Thanks.
post #2 of 7
First off did you back-up each of the card's BIOS' before the flash? If not goto the manufacturer's website and download the latest BIOS. Then when your done with that load it onto your boot drive and find out which card is the bricked one by using this command. "ATIflash -i" Identify the bad card and then flash the bios you downloaded from the manufactures website. That should get it back into a working condition. But no guarantees.
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post #3 of 7
Here is a link to a good thread/guide on flashing your 5850 BIOS.

What you'll need to do is boot up with the good card in the 1st peg (P0) then flash bad card in the 2nd peg (should be P1).
You can find the factory BIOS of your card on TPU's VGA BIOS Collection

Was the ASUS BIOS you used reference or non?
Is your XFX reference or non?

Looks like you either used a non-ref BIOS on a ref card or vice-versa.
Edited by candy_van - 6/6/11 at 8:47pm
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post #4 of 7
why didn't you just change the clock limits in the XFX bios? What made you choose to flash the Asus bios instead?
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post #5 of 7
Lol wondered the same thing.
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post #6 of 7
Thread Starter 
I didn't use an Asus Bios. I opened an Asus 5850 bios in RBE, and saved the signature profile which controls the upper limits. I then opened the original bios for my XFX card and replaced the signature with the Asus one. That is normally the safest way to change the upper limits without screwing anything up, and it should have worked since they were both cards from the same family. I did try just changing the limits on the original bios first, but after that I lost my fan control. It would stay stuck at 20% no matter what I did. And both of the cards bioses were non reference. I did try using atiflash last night with the xfx card in the secondary slot, but it kept giving me an error. I didn't write it down, I will tonight if it doesn't work again. To see exactly what I did to the bios, look at this

http://www.techpowerup.com/articles/.../vidcard/154/7

I did option #1 which was the only way I could get the upper limits to change without messing up powerplay when I Vmodded my old 5750.
Edited by Andon48 - 6/7/11 at 7:09am
post #7 of 7
Thread Starter 
NVM, I fixed it, after a few tries I got it flashed successfully. Thanks guys.
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