Does anyone have BIOS for 2019 iMac 4K 21.5" A2116?
Board model: 820-01237-A
Thanks
Board model: 820-01237-A
Thanks
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Re: 820-01237-a bios?
Ooops. I meant to post it before.
Could someone look at this and see if it appears to be corrupted? I'm troubleshooting an iMac that was working fine and then there was a series of power outages and afterwards the iMac does not POST. Diagnostic LED #1 and #2 are illuminated, but not #3. I did a quick visual inspection of the logic board and found no visibly bad/burned components and found no shorts. Since the iMac isn't POSTing, I thought it may be a corrupt BIOS. Looking at my dump in UEFITool, the parser indicates that there may be some corruption, but I honestly don't know enough about BIOS editing/repairing to interpret the parser output.
Last edited by grimacelord; 02-09-2023, 10:00 AM.Comment
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Re: 820-01237-a bios?
Hi every one. Can some one help me please to remove the EFi Lock on thish bios -This is the start block of SVS 240050.. But I can find the End block to remove it.Comment
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Re: 820-01237-a bios?
I find it is 23E050 - 240050 thanks
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Re: 820-01237-a bios?
So I've been doing some research on my own since I made this thread and I did eventually find a supposedly clean BIOS. I tried flashing it to the chip, but the iMac won't turn on at all with the "new" BIOS. At least with my old corrupt BIOS, it powered on, it just didn't POST.
Attached is my original corrupt BIOS and the new one that I found. Can someone take a look at these and help me? Thank youComment
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I need this please, thanksComment
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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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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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