820-00687-A

Can I use 820-687-a file on a 820-687-b board?

I used the file 820-687-a on my 820-687-b board and it turns on very very slow.

krjavi said:

I used the file 820-687-a on my 820-687-b board and it turns on very very slow.

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Use Medusa to clean ME, after that it will work.

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.

ThienBui, you are amazing!
All worked perfectly fine.
Thanks again friend!

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!

need schematic and boardview

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

no display issue sir please fix no ram detect

please brd & schematic A1435 820-00687 A

u have schematic & brd , A 1534 . (820-00687-A). pls

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?