I have a Samsung Galaxy S3 Lte GT-I9305 & I dont have the update software function or developer settings. I'm on a 2 year contract with Orange/EE (U.K) which ends November 2014. I'm wanting to upgrade my andriod version to the latest one as im still on Android version 4.1.1 I know how to access the phone setting to restore to factory settings & custom ROM using Power off/on button, Homescreen button & Volume up/down button. Any ideas how I can update my android version ? I'm not sure how to do custom ROM and dont want to damage my mobile. If anyone knows how I can upgrade my android version or how I can get the software upgrade functionm to work on my mobile, It would be much appreciated. Not sure if restoring my mobile to factory settings would sort anything out. I am missing out on new features due to not having the latest android version.