First of all, Same as the other people here suggested to you, clean your previous driver using DDU.
Then download Radeon Software Crimson ReLive Edition Beta for Blockchain Compute, use this driver version.
If you plan to modify your GPUs bios, do it yourself with original bios. Remember, it not safer doing something like this:
I'm getting 29.xx with my Asus RX580's after Anorak.tech bios mod. I'm not even "tweaking" the bios; just downloading already modded ones...
Note: If you are Windows users, will be better using windows 10 last updates.