You can cancel through the 'Deregister' menu in the ‘Galaxy Beta Program’ app. In order to use the official software and services, be sure to reinstall(rollback) the final version of the official software. You can re-install software by using the Smart Switch PC software. Once the software is re-installed, the device will be reset and all data which generated during Galaxy Beta Program will be erased. (You can find details from FAQ #11 followed.) Also all data which had been backed up before installing beta software can be recovered but data which has been created after installing beta software may have limitation to recover.
Samsung Service Center also supports re-install the official software. Please contact to Call Center, you will be guided to the nearest service center. - Call Center : 1-800-726-7864
How can I restore the official software during Beta Program?
You can re-install the official software by using the Smart Switch PC software. (You can download it from this link - http://www.samsung.com/us/smart-switch) Please connect your phone to your PC and launch Smart Switch PC software, then you can find the menu option ‘Update’ or ‘Device Initialization’ for restoration.
