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Re: HELP - want to update to 4.3 but can't because deleted music app(rooted)
Resetting the device won't bring back the missing app (I am pretty sure OTA updates look for things like that), nor will it remove root. Graeme Duncan's advice will work. reflashing a stock ROM will get you unrooted, and should allow OTAs again. However, The new update includes a security feature called Knox, which does a wonderful job (sarcastic) at stopping the act of loading a custom ROM, custom Recovery, and sometimes root access.
Originally Posted by Abdal Jaquez
Since you are already rooted, I really would highly suggest looking at custom ROMs.
Look at it this way: Nexus devices, and the Moto X are probably the only ones that are on the most current version of Android, 4.4.2. Samsung is on 4.3 for the S3, with no clear timetable when it will be updated to 4.4. If you choose a custom ROM, especially an AOSP, you can be up to 4.4.2 in a few hours.