For those of you who want to receive OTA (over-the-air) updates and you can’t because you have a custom recovery installed during root, you can easily re-install stock recovery for your Galaxy S3.
Step 1. To, install stock recovery, simply put your phone in ODIN download mode first. Power off your phone then hold down Volume Down, Center Home, and Power buttons together for 5 seconds. Then hit Volume Up when you see warning screen to enter Download Mode.