I am working on Macbook Retina 15" 820-3662-A EMC 2674. It chimes everytime I turn it on but does not boot into any OS (EXTERNAL or Internal SSD). Once only I could boot up into the OS, put in the password & booted up to the desktop. After a complete shutdown, I turned it on again, chimed & then stuck on Apple logo again. First I did a PRAM reset, no luck. I check for any liquid spill on the logic board but very very clean, no trace of any liquid spill. Then I did a Clean ME region of the BIOS & re-programmed the BIOS again, but still get stuck on Apple logo. I am posting the Original BIOS Bin Files for someone to look into & check if this BIOS bin files are the problem or what could be the problem??? Kindly help
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Last edited by mferna14; 06-07-2020, 12:47 PM. -
Re: Macbook Retina 15" 820-3662-A EMC 2674
Try to run ASD EFI and ASD OS.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: Macbook Retina 15" 820-3662-A EMC 2674
Try this bios .Comment
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Re: Macbook Retina 15" 820-3662-A EMC 2674
Thanks for all the help., you very imagine, it was the battery that was freezing up the OS in the start. Removed it, booted up fine. Put in a new battery & all works fine now.. ThanksComment
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Re: Macbook Retina 15" 820-3662-A EMC 2674
Can someone Clean the ME Region on this EFI BIOS dump. Macbook Pro Stuck at Apple Logo.Comment
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Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:
>>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<
Every donation made will go towards server fees and maintenance costs.Comment
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Re: Macbook Retina 15" 820-3662-A EMC 2674
Can someone post a BIOS dump for 820-3662-A for a 2014 2.2Ghz IG model?Comment
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Hello everyone,
I’m currently working on a dead MSI GP75 Leopard (MS-17E71) motherboard (i7 CPU, NVIDIA GPU) with a no display/no backlight issue initially. After extensive investigation, I’m at a critical stage involving EC firmware, BIOS/ME region interaction, and possible deep corruption. I'm seeking advanced insight from anyone with experience in EC/BIOS sync issues or PCH-level behavior. Here’s a full breakdown:
🧩 Initial Issue- Board powers on (fans spin, keyboard lights up and can be adjusted, caps lock led lights), but no display or backlight
- External display (HDMI) shows
07-24-2025, 02:17 PM -
First of all thanks to all of our members who have posted previously all methods posted here.
Please leave a comment if you find something new,or have anything else to add.
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Find by serial number,model number or series
If you know the laptop serial or model number go to HP support https://support.hp.com/us-en/drivers/laptops .
Enter the serial number or model number and click submit.On the next screen you will have to enter the OS
Operating system and OS version.If... -
Hi, my laptop wont boot at all
With original bios no POST, only LED lights
With alternative BIOS from model TP500LN (flashed via programmer) the notebook works again
Some issues
A- with bios from 500LN, it won't update from bios of model 500LA (from 500LN v203 to 500LA v300)
B- If updated from 500LN version 203 to 300, the battery stops being recognized
Things I tried
1- Update / clear ME: Took the non working bios, made a backup, and did this: https://www.badcaps.net/forum/troubl...theory/trouble... -
Hello, I have an old Dell G3 3579 (ST: 2WQ7LP2-8FC8) with a newer 8FC8 BIOS password. I have successfully attached to the flash chip (W25Q128JVSQ) on the motherboard with a CH341A programmer and made several modifications using Intel FIT (e.g., allow software SPI write) without bricking. I was also able to boot to a modified GRUB shell where I attempted to edit many BIOS security related options like BIOS Guard/Lock, Flash Signature Override, ME FW Image Re-Flash, etc.
Unfortunately, some of these modifications like to Intel BIOS Guard failed because it is fused into the PCH. Also,... -
Hello,
I have a Lenovo Thinkbook 15 G2 ITL i5 Laptop (serial number: MP2BFZEF) that when I turn it on, the led on the power button lights up for 5 seconds, then goes out. There's no display and nothing happens.
So I thought it was a Bios problem.
I found 3 bios chips on the board, which I read with a bios programmer: two XMC model bios chips and a Winbond model bios chip. Each XMC model bios chip has two partitions named XM25QH128A [3.3V] and XT25F128A [3.3V]. And the Winbond model bios chip has three partitions named W25Q80BL 3.3V, W25Q80xV 3.3V and W25Q80DV 3.3V....
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