While I cannot provide a set of instructions (I have no FP2 and it was already a bit of an effort to write it for the FP1), it should probably be possible – if you have root on your FP2 – to switch to Fairphone Open OS with an approach similar to what I wrote in this topic:
Someone would have to write a similar guide for the FP2 switch to Open OS. Given the circumstances mentioned before, it cannot be me though, sorry
