Mining GPU BIOS flash - How hard is it really?

[iMonstaa]

Hello! 

Thanks to @DatTestBench and @LukeSavenije I got an answer to my question about mining GPUs and if they are worth it. 
From their answer, I came to the conclusion that the "deal" I found is worth it.

I found an RX 580 4gb that was mining for about a year and a half for 90 euros (about 110 USD). Used hardware prices are whack in my country and that's why I'll refer to this ad as a "deal".

(they were mining ETH btw)

Basically, I found a mining rig with 6 XFX RX 580's. The dude is selling the GPUs 90 eur a piece. The owner claims that the GPUs mined in well ventilated rooms, that they were never overheating and that they were never cooked, fixed or even opened. 
I think that the cards have Mining BIOSes on them and that's why I'm asking the question, HOW do I install a default BIOS? Also, from what I know, some 580's have a switch next to the power connector which switches between the two bioses that they apparently have?

So yeah, how do I install a normal GPU BIOS on a card with a mining BIOS?

[Jurrunio]

ATIFlash

[Sat1600]

First download GPU-Z

 

https://www.techpowerup.com/gpuz/

 

Run it and note the Memory brand (Elpida, Samsung, Hynix).

 

Find the correct bios on the techpowerup site.

 

Make sure that the model, memory brand and the memory size match. You can use a bios with a higher clock speed if the memory size and brand match, but you may experience problems if the card can't handle it.

 

https://www.techpowerup.com/vgabios/?manufacturer=XFX&model=RX+580

 

Make sure that your PC will start with the back up bios. Flip the switch and restart the PC.

 

When you Flash a bios you are flashing whichever bios you are switched to at the time of flashing. If your back up bios works fine, then switch back to the main bios and run ati flash.

 

Save the current bios just in case and then flash the download bios. Restart. If you have problems flip the switch and restart. DONT FORGET TO FLIP BACK when you try again. 

[Mathieu9836]

There is a ton of tutorials on Youtube about that, watch some videos, get the Stock BIOS of your card on Techpowerup, then flash it with ATIflash