I think you need to try troubleshooting. Firstly create a Memtest CD, go down to a minimum memory config in A2.
Run the normal (all) test until you get at least 1 clean pass. If you get any errors, change RAM sticks.
If you have working RAM, download the latest BIOS v1203 and copy to FAT32 USB, use UEFI Flash update mechanism EZ Flash 3 (refer to user manual)
Reset board to setup defaults once restarted. Restart and set only NECESSARY changes to make system work. Have RX480 in PCIEX_Slot 1
Reinstall W10 v1709 and use Radeon Adrenaline 18.2.1
I think you'll have to read the linked post.
There will probably be a stock BIOS at the TechPowerUp repository but you need to run GPU-Z and backup your existing BIOS first.
I'm not going to advise you on how to do it without seeing the exact card or the results of GPU-Z (nor will I afterwards), if you need more support I suggest contacting your vendor / HW manufacturer in the first instance.
I need to know how to flash that, 'cause I don't see it how
I´m going to look to the side, not even going to peek...
I have the solutions.
I will show the step that I've followed.
1.- Install the driver version that windows don't overwrite. (2016 date driver).
2.- you need to flash the bios of the video card RX 480 to RX 580.
here is the link to make the procedure.
I also whatched this video How To: Flash Your RX 480 to an RX 580 & More | Flash RX580 BIOS on RX480 - YouTube
Thanks to everybody who help me to solve my frustration.
Need to realize that if your GPU card still is under Warranty, modifying the vBIOS will probably void it if your brick the card.
Flashing vBIOS on the card is risky. I don't believe it has Duo vBIOSes installed, in case the main vBIOS is corrupted, like certain R9 GPU cards.
Modifying the vBIOS may be the answer as to why your card's driver keep reverting to an previous older driver. But If I were you, I would RMA it back to the manufacturer if under warranty. If not, then take the risk and modify the vBIOS, the worst that can happen is you will need to purchase a new GPU card if the flashing fails.