So I have decided I want to re-root my phone and so with my build being ..290 or something rather than the ..5.. it needs to be to root I looked online and downloaded C6903 14.1.G.1.534 EE UK 1276-2219_R9A the phone went into bootloop when I didn't wipe cache etc (one of the guides said that it would be OK) so I tried it again clearing everything and it worked....well sort of. It didn't have any signal and wouldn't let me log into Google etc. After investigating it turned out my IMEI had been changed to all 0's. Thinking it might be a dud ftf I tried installing the general UK file C6903 14.1.G.1.534 Generic UK 1276-0875_R9A...no luck, same thing. So in the end I had to download and install C6903 14.2.A.0.290 EE UK 1276-2219_R2B. Seems to be working now and IMEI is back etc, got signal but it didn't redownload all my apps and setting etc. Anyway. Any suggestions what I may have done wrong and how to downgrade so that I can root?