Need help with flashing a ripoff S8 galaxy

Hello, recently my grandparents purchased a "good deal" galaxy S8, well of course it turned out to be a ripoff, not only that, but the software is extra glitchy and crashes all the time, not to mention that its impossible to do anything in recovery mode, its upside down and only selection key works, cant confirm anything, so my plan is to install a custom ROM on it, on back it says SM-G950, but lets face it, its definitely not that, the back can be removed to see a glued in 1650 mAh battery (So big..), but the main problem lies within the fact that phone it self is absolutely unusable, at this point you cant even get inside the home menu.

Question is, what ROM would it accept, and what way should it be installed?

Cheers!

Update: The 2nd Version of phone is G920FXXU1AOBN (Galaxy S6)
so basically S6 made to look like S8
So the model is 920F and is supposed to have Mediatek 6578 processor, but this one has 6528 processor thus conflicting with firmware..

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