My Galaxy 551's bluetooth never worked. The GPS did work at the beginning. Then it started to take ages to guess my position. Now, it barely manages to do so. No bluetooth, no GPS... time for a service return I guess. Only thing is, I've installed several non official ROMs on it (currently running Arkas 1.6 or 1.7, I don't remember), and now I want to restore a perfectly official ROM so that they won't blame my fiddling with the ROM. Does anyone have an advice on how to restore the latest officiel (french) ROM ?