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i need Factory rom for RX580/8GB Red Devil PowerColour.
Silent/OC. Help me Please. Thankyou

Best place for you to download original bios is TechPower Up: https://www.techpowerup.com/vgabios/

It's reliable and with a great repository of bios, don't trust in any bios on internet, you can brick your card

For your model I think it's this link, but check twice before doing any flash bios: https://www.techpowerup.com/vgabios/?architecture=AMD&manufacturer=Powercolor&model=RX+580&version=&interface=&memType=&memSize=8192&since=

Edit: Almost forgot, on the link above you'll see more than 1 bios, blick on details on the right side, and you'll see the exact specs of bios and a picture of the card, so it's not hard to find the correct bios for your card and avoid brick.

Thank.im dowload bios form TechPower but it not work.

Can you describe the problem?
What's not working, how are you trying to flash, what's you exact model of card?
Why do you need to flash the bios? Have you tried a bios mod and failed?

You can see on GPU-z the exact GPU you have, and if you download the right bios, and flash the right way, it should work, but if not, you probably have a bricked card

Link of GPU-z: https://www.techpowerup.com/gpuz/

i have same problem but different gpu series.

techpowerup website only provide 256KB bios,
our bios is 512KB size.

although same gpu, same codes, same memory type, when we download bios from techpowerup and programmed it to our gpu using amdvbflash, it will brick our cards.

you can compare, download your bios with amdvbflash and download in techpowerup bios collection website