Hi!
I have 2 new Radeon RX570 Armor 8GB OC with samsung mem. I get only 24mh/s and when I try to OC with AB I get less not more!
I tried to flash a bios from PBE 1.7.5 and it did not change a thing.
What can I do

What OS are you using? Is it Windows? What drivers are you using? Have you switch to compute workload?
https://www.amd.com/en/support/kb/faq/dh-024Some tips are in FAQ, little bit older, but still valid
https://mining-bios.eu/guides-and-miners/bios-mod-faqs/Also make sure you OC the GPU card before you start the miner!
For all the others, use PBE, you don't need to set anything, just load the bios, hit the one click button, save bios and flash it. OC and undervolting can be done in like Afterburner or if you use Linux then in your dashboard or miner. If you want better timings and more tweaking applied automatically you need PBE 3 PRO.
https://github.com/IndeedMiners/PolarisBiosEditor/releases