Hi all, would anyone happen to have a clean bios dump from an 820-3481 a1419 emc 2639 they would be able to share with me? I would greatly appreciate it.
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Re: Need Bios for 820-3481-A
Sure, here is the original bios dump and then one that I cleaned the ME region on. I am not having success with it however, and am wondering if another area of the bios got corrupted beside the ME region. The symptom of the iMac is it boots about half way and hangs, I have checked ram on another machine, CPU and SSD drive and all check out so far. Machine comes on and everything seems to be working except for full boot, both from recovery, usb disk and even imaging internal SSD. Thanks for any assistance with this.Comment
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Re: Need Bios for 820-3481-A
Try booting a Linux LiveUSB.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Need Bios for 820-3481-A
Ok so that is strange, made a bootable Ubuntu USB key and hangs on boot there also. I made a Windows 10 PE bootable USB key and that indeed does boot. This is certainly a head scratcher. Thanks again for your assistance with this. I am at a loss.Comment
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Re: Need Bios for 820-3481-A
Boot in Ubuntu in verbose mode and check where it hangs. And boot macOS in verbose mode too and check where it hangs as well.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Need Bios for 820-3481-A
I have same issue.
Tried several bios dumps , cleaned its original dump . Checked Me strap at motherboard .
Finally no video and only 2 leds. Reballed gpu and video came back.
Booted in verbose mode . It says unsuported cpu unsuported PCH .
did boot once but got freeze at login . I guess with a no recognize pch , sata controller will be extremely low.
If someone have any clue about whats going on with these motherboards will be great.Comment
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hello! anyone got a good working bios for 820-3481? my unit only work when i remove cmos battery.Comment
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You MUST:- Provide the full machine model number, serial number (or Service tag, SNID) and the board model number (see https://www.badcaps.net/forum/showthread.php?t=88758 ) ,The serial number, make, full model number, motherboard model and revision (except QR codes) must be written/typed at your request as per the rules. Not as a picture, part of the file name and so on.
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This is the details of my unit, attached with orig bios file
S/N: C02ND5F8F8J5
EMC: 2689
Board Code: 820-3481-A
can anyone fix it? or got a known good bios with clean me? thank youComment
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I had same issue and it was nothing to do with the bios. Got it fixed by re-soldering the GPU RAM. Hope this will help.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 -
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