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Old 08-18-2021, 02:49 PM   #1
grimacelord
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Join Date: Jan 2017
City & State: Atlanta, GA
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Posts: 144
Default Lenovo Flex 14IWL Bios Editing Help

Hello,

I have a Lenovo Flex-14IWL here that I believe might be suffering from a corrupt BIOS. The device tries to power on, but black screen and no fan spin. The power LED then quickly turns off. I admit I am not 100% certain it's corrupt BIOS, but this is something relatively easy that I can rule out before I begin diagnosing board-level hardware problems. So far, I have:

1. I have saved the original (possibly corrupt) BIOS from the chip using a programmer. This file is 16,384KB in size and is in .BIN format.
2. I have extracted the BIOS image from the Lenovo BIOS update file downloaded from Lenovo's website here. This file is a .ROM image and is 18,093KB in size, or ~2MB larger than the original.

Here is where I am lost. The file sizes are different. I understand I need to edit using a hex editor, but honestly, I am not versed enough in this sort of thing. I'm not sure what I am supposed to be doing with the hex editor. Seems like I need to remove 2MB of data from the update to make it 16MB like the original, but I don't know how to determine what 2MB to remove. I'd really like to learn how to determine that myself, so if someone is willing to give me a hand with this, could you also spend a moment to explain exactly how it is you know what to edit? I'd appreciate that very much.

My ultimate goal here is to have a file I can flash back to the BIOS chip using my programmer and then see if this fixes my problem or not.

Attached are the two files I have prepared. The original BIOS file named original.zip and the extracted BIOS image from the downloaded update named EL4C1211.zip. I am hosting the files on my mediafire account.

Files:

original.zip
EL4C1211.zip
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