Yes, I've reset NVRAM couple times, even reflashed bios, couple times for original —> Oz rom, restoring bios settings and still all the same.
***
What I did today is:
All that I did yesterday, tried to flash OZ, but eventually, nothing is happening.
The methodology was like this:
1) Flash Oz infused ROM, hit ESC, bios setting to default and then make them proper. Reset
2) Hit f12 for boot menu and performing NVRamm rest (screen is flickering, reboot)
3) After boot, OZ "infusion" part and loading SSD with Mac Os installed - nothing. Not verbose mode or HDD activity on a computer case.
4) Logging again into bios, turning off CSM - same result.
5) Installing MacOs 10.13 USB drive and fresh unused SSD - same thing, just black screen, and nothing moving forward.
All these steps I performed with 3 Oz distros, and still, the result is the same. Windows working without any problems, what's wrong with Oz and why it's not loading - I don't even understand.
TO eliminate the problem with "corrupted from" all these countless bios reflashes were performed by 3 different flash drives and checksum of ROM files were the same. SO bios files are not corrupted.
I don't understand the direction where to dig in, because of nothing unusual been made, and if there were something magical, other things are not affected by it.
p.s. P-RAM Reset - for some reason i call it NVRAM reset.