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PROGRESS!!! Removing life boat connector gave me picture/flashing question mark folder, managed to run diagnostic and got VDH002 error (with connector back on). Never got this far, so any idea would be highly appreciated, thanks!

PRAM or SMC reset didn't do anything :/ Even replaced the BIOS chip with a new one a programmed it with original locked file externally - no dice!

No, not on regular basis but thanks for the hint, will try and post results. Got couple of programmers for 25 series eeproms so I am good there, thanks.

Also due to that relative heating of SR2NH (QMS180) chipset I got a "new" one but I am more willing to exhaust all other relevant measurements before replacing that chip.

Edited CBF2CC32 string only. In desperation even flashed back the original BIOS - no cigar :/ Following this research - https://reverse.put.as/2016/06/25/apple-efi-firmware-passwords-and-the-scbo-myth/

Hi all I have a frustrating 3000$ fully specced problem on my hands and I need some experience shared to help me fix this problem. Above mentioned MacBook came for EFI password removal that legit owned brought in, I've unlocked it and the owner was able to log in and all was good (friend -...