Yes, but if I'll simple change EFI folder, will it work?A clean install and then transfering the data would probably be easier, cleaning the system from time to time is always good.
Yes, but if I'll simple change EFI folder, will it work?
Thanks, I will try it and write resultsMake a new EFI on a USB thumbdrive. Boot from that thumbdrive, but choose to launch the harddrive, with your current installation, from the picker. If it works, then copy the new EFI over your old EFI.