Hello. I just bought a Samsung Galaxy S2 on Craigslist and it was fine. I rooted and unlocked the phone, and it was fine. I didn't notice anything wrong with cellphone. I was listening to music with the headphones, and found the volume to be low compared to the iPhone 4. I looked into Voodoo Control and Volume+. This was last night, and this morning the phone restarted by itself. It did it again 3 hours later, and it did it right now. I already searched online, and I've read I have to download stock rom. I downloaded a 300mb file from sammobile.com, and it's the one for my cellphone. Would I just open that with odin in PDA? I'm new to Android, so I don't know much about it. I also read I can't do this because in custom rom it says one, and it's supposed to say no? I read something about a jig, but I'm confused about that. I've been thinking of unrooting the phone. If I unroot would it still be unlocked? Sorry for all the noob questions. I hope I can get some help.