820-3437-B SPI Bios chip replacacing

[dukefawks]

Upload the working BIOS and give me the serial number of the original board.

 

[air_chair256]

Thanks for your reply
here is the working Bios File link

https://www.4shared.com/file/ke0hsur8fi/820-3437-B-Good.html

and here is the Password for not working macbook air : C1MNQ370G086

 

[dukefawks]

BIOS with clean ME, your serial number, checksum corrected and PRAM cleared.

https://drive.google.com/open?id=1kPdGMPHkHwwIFRwPFelnEHyYC1IOE-Bu

 

[air_chair256]

Thanks heaps i programmed the Bios with this file and it worked, thanks so much for your help, i would appreciate if you answer one more question please: so in next time if i face same problem do i need to create a clean ME and write the serial in a working Bios and install it and it will work?

thanks

 

[dukefawks]

The way to create a clean ME as found on various websites is completely wrong, they have no idea what they are doing. It will break many things including webcam, LAN, etc. Just editing the serial number will give an error when you run a hardware test as the checksum on the Fsys block is no longer correct.
Explaining how this all works is way too complicated for the few times you may need this. The easy solution is to buy a "Medusa" from Chipmunk so you can mess around with it yourself. They are not cheap though! It will however fix the ME, correct Fsys checksum and remove EFI lock, etc.

http://www.cmizapper.com