Thank you @foxfreejack@Rob. S.@SchattengestaIt– I managed to macgyver the buttons back functioning by using the double sided electronic repair tape I used to reattach the display. I doubt we will get new videos from FxTec, but a big warning to everyone who is trying to disassemble/reassemble their phone:
When removing the bottom cover, make sure to go nowhere near the buttons, else you will destroy them
When removing the bottom be careful with he fingerprint connector, one wrong move and you will break the cable
When reattaching the bottom cover, make sure to push out all but