everything i read and tried didnt work for me. I am moding the bios as i read to instructions but when i reboot i have the same hashrate.

My steps are as follows:

1. download via atiflash the original bios
2. edit with polaris editor 1:1750 --> 1:2000 and 2:1750 --> 2:2000
3. save the modded bios
4. upload the modded bios to gpu via atiflash
5. patch the drivers

the result is claymore dont recognise the gpu

I got this GPU in factory defaults (SAPPHIRE NITRO+ Radeon™ RX 570 8GD5) and i get 18.0 - 18.8 Mh/s. While reading a few articles on the web i made my hashrate 21.2 - 21.6 Mh/s using MSI Afterburner and adjusting the following settings:

Power Limit: +35
Temp. Limit: 85
Core Clock: 1520
Memory clock: 2250

All this using the original bios.

But i read that this GPU can mine over 29 - 31 Mh/s. I need some help raising my hashrate. My GPU has a Samsung memory.