TC75 - nonGMS to GMS update ?

I cannot change image from nonGMS to GMS (TC75)

I've already installed with, then

install from recovery mode or (reset),

then I'm trying to install but I error appear:

e:footer is wrong

e:signature verefication problem

ro.system.sdram is set to TC75DV11

what step is missing to succesfully apply GMS image?