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Old 11-08-2019, 01:13 PM   #1
mferna14
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Default EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Hi all, I need the CLEAN original EFI BIN File for the MacBook Air A1466 (EMC 2632) 820-3437-B ... Thanks in advance
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Old 11-08-2019, 02:25 PM   #2
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Better post your original dump and tell what the issue is with it.
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Old 11-08-2019, 05:11 PM   #3
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

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.
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Old 11-10-2019, 07:46 AM   #4
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Serial number has to be edited and Fsys checksum corrected accordingly.
Attached Files
File Type: zip 820-3437-10.15-clean.bin.zip (4.20 MB, 1542 views)
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Old 02-20-2021, 10:33 AM   #5
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by piernov View Post
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
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Old 03-02-2021, 12:08 PM   #6
llcoolr
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

hi
newbie here
i have a1466 with firmware password
and i have this programmer
https://www.xeltek.com/refurbished-p...mmer-clone-en/


https://www.xeltek-cn.com/en/sp501s.html


can fix it


i've already removed bios ic it's

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File Type: jpg Sans titre.jpg (77.3 KB, 257 views)
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Old 09-15-2021, 02:18 PM   #7
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

A1466 820-3437-B
AFTER flash dump just sound no display
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Old 09-21-2021, 05:49 AM   #8
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Hi, i got a macbook air a1466 emc 2632 its locked with Efi lock can somebody please help me, i will be very grateful. first attempt on a MacBook
Regards
Attached Files
File Type: rar A1466 BACKUP.rar (3.97 MB, 10 views)
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Old 09-21-2021, 06:04 AM   #9
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by magictouch View Post
Hi, i got a macbook air a1466 emc 2632 its locked with Efi lock can somebody please help me, i will be very grateful. first attempt on a MacBook
Regards
try..
Attached Files
File Type: rar A1466 BACKUP.new.rar (3.97 MB, 22 views)
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Old 09-21-2021, 09:20 AM   #10
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by peste View Post
try..
Hi,
Thanks a lot, it worked you are a huge asset at the forums.
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Old 04-18-2022, 10:08 AM   #11
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by piernov View Post
Serial number has to be edited and Fsys checksum corrected accordingly.
Hi,

Sorry i know this is an old topic...

I'm trying to edit this efi firmware, but I'm facing some problems. I was able to edit SN and the last 4 digits, but I can't find Fsys checksum part, to correct.
The logic board version, is the same of this topic.

The problem: if i let the macbook rest for about 10/15*min, when I try to boot, the fan spins only 1/4 and stops. I press again the power and the fan spins normally, but there is no boot, neither image. So I have to shut down, and when i press the power button again, it boots normally.

Best regards!
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File Type: png Captura de ecrã 2022-04-18 170026.png (47.5 KB, 9 views)
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Old 04-18-2022, 10:13 AM   #12
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by GfilipeZ View Post
Hi,

Sorry i know this is an old topic...
Best regards!
09 27 A7 C3 ,open the bios with UEFITool it will tell you what the checksum should be

https://badcaps.net/forum/showpost.p...43&postcount=5

4.3. Apple
For 2017 and older machines, serial number is stored in Fsys store of BIOS and can be edited with hexadecimal editor. Fsys checksum needs to be fixed afterwards
Search for "ssn", edit the serial number, save, open dump in UEFITool, go to the Fsys store and write down the suggested checksum in the panel on the right. Checksum is 4 bytes at the end of the Fsys store, between one zone of 0x00 either Gaid or another zone of 0xFF, it must be written in reverse order (so last 2 characters from UEFITool must be written first).
See: https://www.youtube.com/watch?v=poA8HByYqTM
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Old 04-18-2022, 10:26 AM   #13
GfilipeZ
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by SMDFlea View Post
09 27 A7 C3 ,open the bios with UEFITool it will tell you what the checksum should be

https://badcaps.net/forum/showpost.p...43&postcount=5

4.3. Apple
For 2017 and older machines, serial number is stored in Fsys store of BIOS and can be edited with hexadecimal editor. Fsys checksum needs to be fixed afterwards
Search for "ssn", edit the serial number, save, open dump in UEFITool, go to the Fsys store and write down the suggested checksum in the panel on the right. Checksum is 4 bytes at the end of the Fsys store, between one zone of 0x00 either Gaid or another zone of 0xFF, it must be written in reverse order (so last 2 characters from UEFITool must be written first).
See: https://www.youtube.com/watch?v=poA8HByYqTM
Thank's for the quick reply.

Yes, i'm following exactly that video. With UEFITool, i was able to find the checksum. What a can't find, is the part on bin file "Gaid". Like the tutorial video, on min 5:55. It appears like i send in the last picture.
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Old 04-18-2022, 10:32 AM   #14
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by GfilipeZ View Post
Thank's for the quick reply.

Yes, i'm following exactly that video. With UEFITool, i was able to find the checksum. What a can't find, is the part on bin file "Gaid". Like the tutorial video, on min 5:55. It appears like i send in the last picture.
Listen carefully to the video from 6 minutes,piernov explains that newer bios versions have no gaid string. Watch the next part at 7:20
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Old 11-15-2019, 06:23 PM   #15
mferna14
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

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?
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Old 11-16-2019, 01:49 AM   #16
SMDFlea
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Quote:
Originally Posted by mferna14 View Post
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
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Old 11-16-2019, 12:52 PM   #17
mferna14
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Very good knowledge youtube video for me & other too. Thank you very much
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Old 11-16-2019, 01:02 PM   #18
mferna14
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

Very helpful & great youtube video presentation. Appreciate & thank you very much for making me understand....
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Old 12-12-2019, 06:10 AM   #19
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

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).

Code:
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
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Old 12-12-2019, 06:49 AM   #20
piernov
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Default Re: EFIBIN File MacBook Air A1466 (EMC 2632) 820-3437-B

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).
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