820-3209 EFI/BIOS Help needed =)

[OskarB98]

Hello!

I have a 13' Air 2012 (A1466 Apple MBA) which I think has a corrupt EFI as it fails to install macOS after a failed update (I've tried basically everything except repogram of EFI)

Could somebody please help me with a clean ME EFI bin? :-)
I have this dumpfile from the Internet (https://easyupload.io/8euf2x)

Any help is hugely appreciated!

[SMDFlea]

Re: 820-3209 EFI/BIOS Help needed =)

Post your own original bios backup ,and the serial number

[OskarB98]

Re: 820-3209 EFI/BIOS Help needed =)

Post your own original bios backup ,and the serial number

Will do! It's most likely damaged but I'll upload in 5 mins

[OskarB98]

Re: 820-3209 EFI/BIOS Help needed =)

Sorry for delay, will post it later today!

[OskarB98]

Re: 820-3209 EFI/BIOS Help needed =)

Post your own original bios backup ,and the serial number

Here is a dump I took from the original SPI-chip https://easyupload.io/e012n4'
SN: C02K60RCDRVF

Had to desolder it, sorry for delay!

[OskarB98]

Re: 820-3209 EFI/BIOS Help needed =)

Post your own original bios backup ,and the serial number

The issue that makes me believe it's EFI-related is this:

I can't reinstall OS, It tries to start the install but then fails and displays an error (it seems to happen at start when it usually does the EFI-update part)
I've tried two different internal drives and one external drive, different date/year, PRAM-reset etc etc.

Only thing left to try is to reprogram EFI-chip with a known good EFI!
https://easyupload.io/e012n4

[OskarB98]

Re: 820-3209 EFI/BIOS Help needed =)

Anyone got any ideas?