Hiya, I have an iPad which currently has 4.2.0GM (build: 8C134) I am not a developer but my brother is and he installed the GM on my iPad on his account. Now that 4.2.1 is released I have tried to update but iTunes just says that the current software is the most recent. I have tried to restore the iPad in the hope it goes back to a previous version but iTunes says "the resource *iPad name* cannot be located" even though the iPad shows in iTunes as a connected device. I'm guessing that my iPad is in someway linked to my brothers account and is for some reason stopping me upgrading? I have tried downloading the new file from apple direct and clicking shift update but the file is not extracting as an ipsw (I have windows 7 - sorry!) Any advice please?