amibios 5.12 modding help

[osku81]

Hi.

I have ami bios v5.12 - all good- except that it's efi/uefi portion doesn't hold EFI shell at all. Bios though, does support shell.efi from file system; this just brings a minor cosmetic problem, I don't want my boot drive's root to hold shell.efi - it's ok to hold it in, for example, /EFI/tools/shellx64.efi - but it is found only if located in root of drive. I was wondering if it's possible to change it's location.

With UEFI Tool (yes, whilst computer that I am editing holds Linux, I do most of my work on Mac - and I do not have currently any computer running windows, sorry..) - I can do a search, for shell.efi - and hooray, it finds it from 2 places. Problem is that when I view the data, in hex editor, search the offset mentioned from search, I see that it seems that if I touch there, I will break it. So, I could extract body..... And maybe edit it with something else?

Any ideas would be welcome.

[osku81]

I have been provided with BIOS image by manufacturer. AFU tool.. Currently I do already have setup with REFind that allows me to execute shellx64.efi, but I would love to get native way to work as well. I am familiar already with minor modifications of BIOS image; when I purchased my device, I was given option to customise BIOS with desired boot display; unfortunately they forgot to do it, so they gave me bios image... Well anyway; even though I managed to do that, I wouldn't want to tamper it too much..

My previous work I've successfully done with UEFITool as I don't have Windows machines and UEFITool worked succesfully with Apple.. Anyway, point is that I don't know where to exactly look for information where it is detailed where it should search for shellx64.efi and wouldn't want to start guessing due to risks; so I though that maybe I could get some pointers on where to look for it?

[osku81]

Adjusting the BIOS firmware image using the AMI Firmware Update (AFU) utility is one approach accomplish this. It is possible to edit the firmware image to change the path of the EFI shell executable after extracting it from the motherboard using the AFU tool. After making changes to the firmware image, flashing it back onto the motherboard is the next step.

All above is perfectly clear to me. But where in the extracted image is it located, I can't just extract every piece of it, there are ~thousands of entries.