uninstall android 8 oreo beta version

Thanks for being with Samsung and for sharing your concern. You can re-install the official software by using Smart Switch PC version. For downloading Smart Switch PC version, you can refer the link-www.samsung.com/smart switch. You need to connect your phone to PC, and launch Smart Switch PC version. There you will find ‘Update’ button. When you press ‘update’ button, Smart Switch PC will guide to restore the official software.
In order to avoid any data loss, Samsung recommends to create backup data before you rollback to N OS software in your device.
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