I bought a rooted G2 from ebay. Not knowing anything about rooting, I am somewhat uncomfortable. What must I do first? I read somewhere that I need to save factory ROM in case. Where is factory ROM and how to save it? 1. According to the seller, it is cyanagenmod rooted. How do I know it? 2. I see SuperSU in apps. This is the only sign of rooting I can recognize. 3. Settings > About Phone > Status. IMEI 0. Something wrong? 3. Settings > About Phone > Software Update > Update Now. "Your phone is not registered yet." Can I not update my phone when Android 5 comes out? I am connected to Cricket LTE. Everything seems to be working right. Thanks.