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820-00687-A

Hi ThienBui,

The bios that you posted is it a clean dump one?
If not, is it possible to send you my bios bin and clean it up for me, please?
Thanks.
 
Everyone who is using EFI BIOS SPI flex cable (without removing the chip from the board), make sure that the cable is making a good connectivity between pins and the programmer.
It happened in my case to not be able to read or write.
Just find the right orientation/position.
And also, after the whole process, make sure that you reset the nvram for 2-3 times, because some times pieces of information gets stuck and it acts weird (boot loops, black screen, stuck on logo, starts very slow) and this might fix.
In rest, good luck guys!
 
Last edited:
Hola, alguien que me ayude a encontrar en placa, PP3V3_SUS para 3.3Vy GND para programar BIOS
porfavor, Muchas gracias.

Macbook A1534
820-00687-B
 

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a.jpeg
Hi
I have 820-00687-B
this board have broken efi chip, i replace it with good one
machine power up with ? mark
I flashed efi chip with APPLE 820-00687-A,bin , machine power up , i see apple logo with no backlight
i tried no_serial bin also same issue

any solution for this machine or it must flashed with revision B bios dump?
 

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