I have seen modify Bios for RX580 many version. 
I have XFX RX570 4g.  Not modify bios, mining ETH at 26.5M

I try to modify bios as copy 1:1500 to line 1:1650 to 1:2000 and 2:1500 to each line.
It is not working.   


Please comment on RX 570 Thanks in advance.