It's complicated but you've never actually have to use Flashtools to get off the earlier version of the mobile, so you'll understand me, formatting and truck in the old version, as you mistake or do badly, the mobile can be brick (ie valerte not at all) why I said that complicated, hau many manuals and videos on the network, but if you expect .... just a little take out a review and / or update the problem, not your truth.