Metal gear solid peace walker

[stal3]

Is there any way to make the CO-OP in MGS Peace Walker work? Me and my friend tried literally everything we have found, and nothing works. Even the builds that some people reported to fix the problem, made no difference. Versus Ops works just fine, but when we try to play CO-OP this happens: we can see host's game, join, start the game, and then screen goes black and after a while disconnection error message pops up and that's it. I would've given up by now, but surprisingly some people DO seem to make it work but there is very little info on this. Any ideas?

@EDIT
Problem solved. We used Evolve instead of Tunngle. It works almost perfectly with PPSSPP 1.0.1.