How to mod Lenovo bioses?

[davide136]

Hi guys, i work in a business which sells refurbished laptops, we want to sell them with battery in good conditions and we have a lot of problems with recent thinkpads because, if bios is updated, 90% of the time compatible batteries do not work. We need documentation or a place to find patches for uefi, we don't want to request every bios, it's too much to ask you because we have lot of models and they have different revisions. I'd really like to learn instead.
Thank you very much.