I had my phone rooted but have unrooted it with the Z4? app. I have been reading everywhere that in order for my phone to be updated OTA or manually with a new OS, it has to be back to a stock OS. So, since I "unrooted" my phone, am I at that point , or do iI have to go throught the whole flash the SBF process? I have downloaded everything I need to do that, but dont want to if it isnt necessary. Thanks