mobile

So my mom has this tablet for some years now(PIPO M1 MAX), seeing her struggle every day by how slow it was I though it would be nice to flash a better rom(the worst idea I had this month) ,it seems that I have some special variation and all the roms I tried had the y axis inverted(only the touch) while it was working just fine for all the other users,
I found one rom which is not .img and I have access to boot.img ,system.img etc .Is there any config file in them to edit to fix this?
I saw somewhere that I can edit the sysconfig file, but I cant find it.Where should it be?
All the other ways I found evolve editing the script.bin but for some reason uberizer cant find it.

I am totally unexperienced with roms etc... so speak to me like you would be speaking to your grandma about rom flashing.