hm, I'm not aware of this. What do you mean with "False Maemo5 update"?
The mp-fremantle-205-pr package appears to be a dummy package that describes ALL of Fremantle. The removal of this package MIGHT cause headaches down the road when PR1.3/4/2.0/whatever comes out (or any distribution upgrade for that matter). In any case, re-installation of that dummy package and the removal of openobex1.5 would fix the problem... I just checked on my phone and I HAVE removed mp-fremantle-205-pr (like I said before, I probably forgot to document it). I have not run into any issues regarding that package yet.