I have just recently dismantled my Harmony 785 remote and there are the 4 screws behind the battery cover and there are also 2 screws up the top behind the black plastic front, either side of the activities button. You need to peel back the black cover to reveal the 2 extra screws undo them and then the remote comes apart quite easily, just beware of the charging terminals as the wire is not very long, but they do plug into a little connector on the main PCB. Hope this helps anyone else in the near future. If you require I can take photos and post them to illustrate what I mean.