In order to reassemble this, simply reverse the steps with some details to take in mind, these being:

Rubber contacts must be flat into the surface and the hollow side looking up, In green is correct placement, In red, incorrect

The piece of rubber that hold the membrane in the board has a position as well, where its corrugated side must face down onto the membrane

everything and membrane on place (refer to step 2 photo), the cable has almost nothing holding it on place, so make sure it's positioned correctly when putting the back cover back on place