EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

[mferna14]

Hi all, I need the CLEAN original EFI BIN File for the MacBook Air A1466 (EMC 2632) 820-3437-B ... Thanks in advance

[piernov]

Better post your original dump and tell what the issue is with it.

[mferna14]

Thanks., Cannot even read the BIOS Chip., its totally dead & in the BIOS Writer/reader it say no chip detected (NO CHIP FOUND). tried other chips & all works fine on this reader.

[piernov]

Serial number has to be edited and Fsys checksum corrected accordingly.

[mferna14]

Thank you very much... This is the first time I am going to program this BIOS. Just to verify & ask you that Serial number has to be edited and Fsys checksum in the HEX Editor?

[SMDFlea]

Originally Posted by mferna14

Thank you very much... This is the first time I am going to program this BIOS. Just to verify & ask you that Serial number has to be edited and Fsys checksum in the HEX Editor?

Yes it does. check this useful youtube video https://www.youtube.com/watch?v=poA8HByYqTM

[mferna14]

Very good knowledge youtube video for me & other too. Thank you very much

[mferna14]

Very helpful & great youtube video presentation. Appreciate & thank you very much for making me understand....

[Mapiro]

Hi, I'm new on the forum.

Me too I'm fighting with MacBook Air Early 2014 bricked by Catalina upgrade (screen totally black, key combinations do not work).

I bought CH431A programmer and I build my own connector (very micro-solding challenge).

@mferna14
Did you try doing as https://youtu.be/Y7l6X51LQk4?t=124 ?
With this trick I'm able to detect the chip.

@piernov
I downloaded the firmware you posted (thanks for that).

strings 820-3437-10.15-clean.bin | grep EFI
  EFI Version:  117.0.0.0.0

Here
https://eclecticlight.co/2019/10/08/...ing-version-4/
i read that the Catalina firmware should be 118.0.0.0.0 and here
https://eclecticlight.co/2018/10/31/...ing-version-3/
i read that 117.0.0.0.0 should be the last Mojave firmware.

Could you confirm that the binary you posted is from a working full-updated Catalina system?

I have also other questions for you, in order to solve my problem. Do I have to open new thread or I can continue on this one?

Thankyou,
Mapiro

[piernov]

A yeah it was from a Catalina beta, dated from the 11 august 2019 on my end, so it may not be the latest version, however it has APFS support at least. But it's from a working system.
You can at least flash it and try again the upgrade to Catalina, it's not supposed to fail every time.

If your issue is not related to EFI/BIOS then yes please open another thread (outside the BIOS section).

[Mapiro]

Thankyou piernov.
(BTW: I really liked your mac-videos on YouTube, after seeing them I searched for your contact to to ask you some questions, without success. By chance, I found you in this forum! ).

My CH341A detects the EFI chip only if I do as in the video I posted: internal battery disconnected, external power connected and then PC powered down by pressing power button.

This way I can read EFI more times, getting identical dumps, until I unplug the external power.

If I unplug and replug the external power, power off the mac pressing power button and finally try to read again the EFI, I get a EFI dump that is different from previous. The differences are not single sparse byptes, they seem to be in blocks. It seems that the differeces are around 1% of tytes.

Next reads are always identical.

1)
Is it normal? Each dump I have could be considered a "good" backup (ignoring the fact that the current firmware is bricked)?

2)
Could the EFI be in a infinite loop of attempts to complete a faulty internal-update-procedure ? (the mac died during Catalina update).

Mapiro

[Mapiro]

• FW downloaded
• Serial changed
• Flashing...
• Power reset -> Mac back to life!
• Reinstall -> Catalina update -> All is fine!

The "not last version" of the wirmware was an unexpected benefit because now I can see that Catalina updated again the firmware with the very-last release (118)

Thankyou very much for the support.
Mapiro

[Perovski]

hi gays who can clear me this bin for macbookair 820-3437-A

[peste]

Originally Posted by Perovski

hi gays who can clear me this bin for macbookair 820-3437-A

try..

[Perovski]

thinks pest for your help ui test and reply

[elbtonet]

Hi friend I have my macbook air dump bios bin file ..it starts but no display
i think is a bios issue please can u help me if there is a problem with the dump??

[peste]

Originally Posted by elbtonet

Hi friend I have my macbook air dump bios bin file ..it starts but no display
i think is a bios issue please can u help me if there is a problem with the dump??

the posted bios is not ok ... try this ..

[Perovski]

hi pest i pupload your dump and now dead machine thinks any way have you other solution

[peste]

Originally Posted by Perovski

hi pest i pupload your dump and now dead machine thinks any way have you other solution

try post # 4 ..

[alterr333]

Originally Posted by piernov

Serial number has to be edited and Fsys checksum corrected accordingly.

Done that and got my mac back on track!

Thanks mate! you've made a new suscriber to your chanel