820-00165a not detecting year /model after change sn

Yoel Ren

Member
Hi, so I have bought medusa 3
I have mw own 820-00165a i personally use, which doesnt have matching back case number, i get a bios from same model, read, and write it, i has clean me and fix checksum, but the year of the macbook didnt show up, what seems to be problem?
 

Yoel Ren

Member
One thing to note is, the fan doesnt cycle 3 times after change serial number, instead 1 cycle and its turned on
 

2informaticos

Administrator
Staff member
The 3 fan cycle is valid for 3437 board; 00165 must start directly.

Try to build another BIOS again, for the year issue.
 

Yoel Ren

Member
okay i would try, this macbook is also DEP locked from a unnamed university, can the dep locked be unlocked with svs clear like icloud lock ?
i got this board by buying dead board when I still couldnt microsolder repair a few years ago, im from third world country so our law regarding this is still weak, i wouldn;t get busted by fbi or something xD
 

2informaticos

Administrator
Staff member
Yes, change SSN and fix Fsys checksum.
You can try the files as you get them, just for testing and comparison purposes.
 

Yoel Ren

Member
any tutorial to change SN without medusa ? ( I havent buy the accesorry keyboard for medusa yet )
 
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Yoel Ren

Member
or can you please make me two 820-3437 bios with serial number :
C02LR2V56T5
C1MPP4KSG940
i will do the clean me and fix checksum with my medusa.., thankss
 

2informaticos

Administrator
Staff member
If you do it yourself will end learning, which should be in your advantage.
Make a backup of your boards first.
You can use any known good working BIOS file.
Open it in hex editor, modify serial number, upload to Medusa and do the rest on the MacBook board (with Medusa).
Try, try, try and come back if still need help...
 
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