I don’t know why MEA dosen’t read, neither does MCE. But image opens fine in FIT, so cleaning according to winraid.level1techs.com/t/guide-clean-dumped-intel-engine-cs-me-cs-txe-regions-with-data-initialization/ will work OK.
(Bios update from Lenovo contains complete image, one could transfer ME region from this update file, too)