Thanks for all, I managed to use the third-party WWAN without "official" downgrade.

I was thinking about that, and I googled around together with examining thoroughly Lenovo website, but 2.12 BIOS is not available for download.... If someone has it, it may help as well.

I want to use third party WWAN card and the modded BIOS is 2.07. It won't let me downgrade, even with original BIOS (2.07 and previous versions as well).

Hi there, I have an X61 7675-K2U factory shipped with BIOS 2.12 (7NETB2WW). I would like to downgrade it back to 2.07 but both winuptp and the bootable CD says that "BIOS image file does not match this system.". Is there a way to force the downgrade? I was even looking for 2.12 on Lenovo website, bu...