id's
gt840m : DE 10 13 41 in hex on bios : DE 10 41 13
gt940m : DE 10 13 47 in hex on bios : DE 10 47 13
Changed video roms by uefitool, edited 4 places on OemServicesDriver for gt940m still no identical nvidia driver.
I have attached bios dump, acer version 2 of 940m vbios's, 1of asus version vbios's.
Help :)

It's not impossibe to do with youк wishes unfort. especially if get dump from different model...

отредактировал phenixom

The dev id changed but subsystem id didn't change. dev_1347&syssys_08691025&rev_a2
Modded driver also doesn't work.