HELP: 2015 13" MBP - POMONA?


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2 years 10 months ago - 2 years 10 months ago #7708 by greybaron
JI am very concerned that I won't be able to fix my MB's corrupted EFI firmware. It is not iCloud-locked, just corrupted and the machine won't start.

My Mac uses the very flat MX25L6473E EEPROM chip.
I have read that the POMONA clip won't work. Why is that? I want to use the POMONA clip because I already own it. I don't now if it makes contact, the chip is very thin.
Also, I don't know if flashrom supports it.

Whenever I try to initiate dumping or flashing, flashrom reports that no EEPROM chips are connected. I use the pinout from the instructions from this site:
ghostlyhaks.com/blog/blog/hacking/18-apple-efi-bypass

I connect the cables to the GPIO just like in the guide. SPI is enabled.
Is the pinout the same like in the text?
How can I dump the chip if it is not detected by flashrom?

PLEASE I need help on this one. I can't repair the MacBook without help.
Last edit: 2 years 10 months ago by greybaron.

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2 years 10 months ago #7710 by cyber16
You CANT use the POMONA clip on the chip
You can only remove the chip and program it externally, or hardwire leads to some contacts points or the recommended method, use a clip/adapter that matches the debug port on the logic board such as those sold here.

Try the debug port, also you will need to find a donor efi dump with a adjust SN & Clean ME region if you can not get the ME from your current efi

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2 years 10 months ago #7722 by greybaron
Hello Cyber16, where can I get a clip for the debug port, what is the name for such a clip? And how would I connect the clip for the debug port to the Raspberry Pi? I need to read, erase and write.

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2 years 10 months ago #7727 by cyber16
www.ghostlyhaks.com/shop/product/easy-flash-adapter-v4-0-3

Connection points for a programmer including the PI are labeled on the clip

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2 years 10 months ago #7728 by greybaron
Thank you very much.
There is still one problem:
On the site of the EasyFlash 4.0.3 is written
That it MAY brick my device (MacBook Pro 2015 13")
OF COURSE I don't want that. Does anybody know how high the risk is? Is it PREVENTABLE? Why does it happen?

Thank you very much!

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