The memory type of the card is micron.
I also tried to modify the bios with polaris, but that didnt work either.
Really stucked here.
Go and download some ready made bios from other persons for your specific cards and your specific memory. The website is Anorach Tech , search there and I am sure you can find a lot of already modified bios and I have seen this card doing easily 15 Mhash after the Bios mod without problems.
Here is a link for you to check.
https://anorak.tech/t/rx-560-4gb-on-ethereum/7493/269You have some bios modded for Hynix memory, but asking there for a micron mod should be easy, make sure to upload your original bios.