Can't Read EFI CHIP 25Q064A on my MBA mid 2012

Hi Guys,

i've tried many times and be deperate now

i can't read my EFI chip flashrom errors No EEPROM / Flash Device Found

i have an Raspberry PI B+ and SOIC Clip connected to it. I followed the guide of thaGHOST.

I hope you can find my fault and could help me.

I attached an image how i connected the wires.

Thank you

That Mid 2012 is a BGA chip and its nearly impossible to use a SOIC clip on it, I tried for weeks making adjustments to the legs on my pomona and never got it to work.
In addition, there are surface mounted components, small resistors near the efi chip that very well could get hooked by the clip and the possible unintentional removal of them

You need to either use a MBA Easy flash or full removal of the efi chip "NOT Advised" or attach the leads to a few pads/traces Again not advised if a noob as the risk of lethal board damage is high

I made the same mistake/attempts a year ago and never got that clip to find the efi chip, hence there is no recommendation here using one on the MBA that has a BGA. They worked fine on other non BGA chips

Hey Guys,

thank you for your answers. This makes sense. Okay i think i donate soon for the new project.
I thought it works with the Clip. But i think i cant wait till june so that i give the board to my dad und let him solder wires to the chip


Thank you very much!

So apple switched to BGA, but still left a header on the mobo and the bga chips can still be interfaced??? That's awesome lol..

Does someone borrow me the mba easy flash and send it to Germany ? (i pay the shipping)
I cant wait till june , i will donate then for the rev 3 because its an awesome project.

This would be very very awesome. I hope someone will do :/

Greetings

Hey,

im finally able to read the EFI

my mba: A1466 (EMC 2559)

now i have a big problem. After read out the N25Q064A..3E 3 times and matching the hash
i deleted the $SVS as in the tutorial and wanted to write it back but it failed every time.

Erasing seams to doing right , writing sometimes failed to erase and goes with another erase function till Erase / Write success

but then flashrom wants to verify and then it failed all time


one time i get the error after trying to verify

My MBA does not start anymore now. I trying to write the original Backup back but in the verifying process

in the Attachement the 2 files.

Read1.bin = my original
write.bin = my modified unlocked binary


Someone can help me ? Did i somethink wrong ? Are my EFI-Chip now damaged?


in the read process flashrom detected my chip

What does this mean ?

Thank you for your answers

Your problem is with the chip, replace it with another to us to last several times.

now ive tested the process.


i erase the chip - function 0 failed after some time - function1 ERASE DONE

i read out the chip - open the bin - there are only ÿÿÿÿÿÿÿ -> erasing works

i erase the chip again - no errors - ERASE DONE

i read out the chip again - open the bin - there are only ÿÿÿÿÿÿÿ -> erasing works

i write done the original dumb - WRITE DONE - VERIFYING FAILED

i read out the chip - open the bin - some lines are missing - the original has 39750 and the current 39738 lines


Whats the Problem ?

after 2nd write process i read out the chip again and now 39757 lines and another hash
after 3rd write process i read out the chip again and now 39750 lines like the original but another hash

Your problem is with the physical chip, you have to change that will not work with any programmer and we have tried the same with the raspberry, minipro and other. Change the chip!

now i have successfully verifyed my chip with the original dumb !

hmn damn 1466 .... now after verifying i do the scan-n-patch method for my original dumb. I go through the tutorial.... I wrote it on the chip and VERIFYED. But my MBA didnt start at all. The FAN spin but nothing hapens..... i dont understand it

the funny is - all the failed trys the logicboard was connected to the battery and the charging cable was on

after i disconnected the battery and proofed all cables it goes smooth

today i have all the process done smoothly

Erase, Write and Verify without any Errors. But the Macbook Air didnt start..... the fan spins for short time and then stops

no beep - no display ... could it be that in the soldering process the traces be damaged on the board ? My dad soldered really carefully...

Did you use that efi firm that I uploaded?
I have many Mid 2012 1.8GHz i5 A1466 roms, most are from the 8GB model
If you need another, let me know

jeah your Rom works perfectly smooth. I think i need the 4GB RAM one.
It would be very nice if you can upload it.

Thank you again