MP 1,1-5,1 Mac Pro EFI Chip flashing experts out there?

[Morris_Morris]

Hey,
i figured out in another thread, that my mac pro 4.1(patched to 5.1) has a EFI based booting problem.
Now my hope is to get it back working with an older OS X el capitan version as a boot stick, original cpu etc. and a corresponding flashed EFI Chip ( seen in this thread ).

I also saw people flashing EFI Chips with Raspberry Pi. Any chance somebody could help me find out where to get a clean el capitan version and how to extract the EFI code plus flashing the chip?

 

[tsialex]

Hey,
i figured out in another thread, that my mac pro 4.1(patched to 5.1) has a EFI based booting problem.
Now my hope is to get it back working with an older OS X el capitan version as a boot stick, original cpu etc. and a corresponding flashed EFI Chip ( seen in this thread ).

I also saw people flashing EFI Chips with Raspberry Pi. Any chance somebody could help me find out where to get a clean el capitan version and how to extract the EFI code plus flashing the chip?

Mac Pro 4,1/5,1 SPI flash is not flashable while soldered on the backplane, you will need to desolder it first. This is extensively covered around September last year in the BootROM thread.

 

[Morris_Morris]

Thanks for the link! I'll have a close look. Didn't found it on my own...