What would be the general steps to take to update to 4.3 from 4.0.4. I messed up my phone a while back updating (no signal basically, no calls, etc, yeah... my fault for not reading...) so I had to take it to a shop. They downgraded to 4.0.4 and I'm not even sure my IMEI is the same...
Anyways, how can I upgrade and not lose their "fix". I remember reading about backing up my modem, flashing then reflashing my modem. Would that be enough?
Is there any backups that I can do that will create an "image" of the phone that I can safely flash back to in case anything goes wrong?
I currently have SuperSu and I think CWM (but an older version).
Any help would be appreciated!