OK, so I have a problem, even a few.
So I have been on Kmew (at least I think it was it, pretty much sure) and made update to Rebug 4.21.2 via XMB. But later found out, that to get eid_root_key I need to be on 3.55 so I tried to update it via XMB to Rebug 3.55.4 but got error data corrupted etc. Instruction says, that its the way to do it if QA was enabled, which one I enabled with toggle_qa.
So by searching online I didn't find really the answer. Some say use Recovery Mode. But then I go to recovery and connect my PS3 Joystick I got this: "The System Software cannot be run correctly. Press PS button to try to restart system." etc. So I cant even get to Recovery Mode. By searching online I find just that this error get people who changed the hard drive , but I just changed CFW, not hard drive.
I just don get it, what happened? Maybe Rebug 4.21.2 CFW where installed badly? If needed I can try to update to 3.55 again and get exact error code.
The think, why I need to get to 3.55 is to get eid_root_key, because I don't have BD-ROM drive so I want to make Rebug 4.21.2 to run games discless in DEX mode.