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How can I turn a bios file into a readable format?
- Thread starter awbower
- Start date
Search the file in HxD for SSN...
I downloaded UEFITool NE and searched for SSN. It specified the following destination: EfiCrc32GuidedSectionExtractionGuid/PE32 image section at header-offset 314Ch. After navigating there, the contents did not show anything related to the serial number. I attached a screenshot. What am I doing wrong?
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Did you try a simply hex editor?
I extracted the file (PE32 Image Section) and opened it with HxD. I attached a screenshot. For the most part, the decoded text is just nonsense. I feel like I'm doing something wrong though because when I open up a known working bios file in HxD the decoded version is also not intelligible.
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I take it back... for some reason the search function didn't work initially. I tried it again and found the serial number hidden among all of the gibberish.
Can I get clean bios files for 820-3115 and 820-00165?
Also, I know that you can't take a bios chip from one motherboard and transfer it to another motherboard and have the computer work properly... something to do with not being able to properly communicate with the PCH. When I upload a clean bios file to a board, is there anything else that I have to do in order to make the computer function like it should?
Thanks
Can I get clean bios files for 820-3115 and 820-00165?
Also, I know that you can't take a bios chip from one motherboard and transfer it to another motherboard and have the computer work properly... something to do with not being able to properly communicate with the PCH. When I upload a clean bios file to a board, is there anything else that I have to do in order to make the computer function like it should?
Thanks
If you plan to deal with Apple repairs, get Medusa programmer; is a MUST in this business.
You can also clean ME manually, but take more time to remove/resolder SPI cheap.
If you have working BIOSes and only want to clean their ME region, upload them somewhere.
We also have some links for clean ME files on the forum.
Building BIOS file from a chip read from other board, will require changing serial number.
This also imply fix checksum of Fsys area.
You can also clean ME manually, but take more time to remove/resolder SPI cheap.
If you have working BIOSes and only want to clean their ME region, upload them somewhere.
We also have some links for clean ME files on the forum.
Building BIOS file from a chip read from other board, will require changing serial number.
This also imply fix checksum of Fsys area.
I did some research... does this seem correct?
1) Start with a good BIOS with clean ME region for your motherboard (in my case 820-3115)
2) In HxD, calculate the checksum (Apple uses SHA-1 format) prior to making any changes. Record this number.
3) Change the serial number to the correct value.
4) Calculate the new checksum. Subtract the new checksum from the original calculated in step 2.
5) Change a "useless" area of the BIOS by the amount calculated in step 4. Now, after modifying the serial number, the checksum will still be the same as originally.
1) Start with a good BIOS with clean ME region for your motherboard (in my case 820-3115)
2) In HxD, calculate the checksum (Apple uses SHA-1 format) prior to making any changes. Record this number.
3) Change the serial number to the correct value.
4) Calculate the new checksum. Subtract the new checksum from the original calculated in step 2.
5) Change a "useless" area of the BIOS by the amount calculated in step 4. Now, after modifying the serial number, the checksum will still be the same as originally.
Theory sounds good...