Is it possible to run stock VD with Xionia? I don't want to be bothered with my sister's phone all the time on custom rom, she complains about every minor FC it may enounter...so i'd just prefer going back stock with her, but keeping her on Xionia if possible -- I'm on VH right now, so I have to KP500 diag anyway, but wondering before I do all of that what I should do when I'm done, and if I'll get the update nag.