I am able to read and write the ROM using freedos/flashrom just fine. All the goodies are in Setup_body_IFR but this is all

Form Sets
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Offset: Title:
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0x19094 Setup (0x7)

any pointers?

I fumbled through several guides and was able to get the more advanced menu unlocked, which in turn luckily gave the the PCIe option that prevented this t630 from constantly rebooting after installing an M.2 ethernet adapter.

Any chance you could post the patched ROM to get these hidden menus available? Running into the same problem.

Can you kindly share what settings did you changed in the moded bios to enable installation of M.2 ethernet adapter?