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I think that's only for BIOS updates, not ME. ME uses an Intel provided flash EXE. It would probably run on PE or definitely Windows to Go though.

Ahhh, my bad, sorry!

I figured out how to install it using Windows PE. First, get a Windows installer image or WADK and mount it. Microsoft provides these, but hides the download link well. Then get the ME firmware update installer and the AMT/ME software installer from Lenovo and execute the unpackers with wine. From ~/.wine/drive_c/DRIVERS/WIN/AMT, do "cabextract SetupME.exe". You can discard everything but the "HECI_REL" directory from this, including SetupME.exe.

Now you need wimlib to create the WinPE image: "mkwinpeimg --windows-dir=/mnt winpe.img --overlay=$HOME/.wine/drive_c/DRIVERS"

The resulting winpe.img can be dd'ed to a USB thumb drive. Boot into it, and execute "cd /WIN/AMT/HECI_REL/win10", "drvload HECI.inf" (to load the MEI driver) and then "cd /WIN/ME/", "MEUpdate.cmd" to update the ME firmware.

Unfortunately I couldn't find the bootable cd version for the intel management engine firmware and software updates. Mine is a thinkpad t460s.

Thanks, I'm gonna look into that!