Restore Shipping Software
To use a previously-released version of iOS or macOS, you can erase your device, then restore from the iTunes backup or Time Machine backup that you created before you installed the public beta. You can also restore shipping software on your Apple TV using iTunes on your computer and then re-download any purchases.
Make copies of the files you want to keep.
Since you will be restoring from the backup that you created before you installed the public beta, any files you created or modified after this backup will not be preserved when restoring. To make a copy of these, open Finder and select the files you want to keep. Then drag these files onto a different storage device, such as a USB thumb drive or external disk.
Restart into macOS Recovery.
Make sure your backup drive is connected. Then go to the Apple menu () and select Restart. Once your Mac restarts hold down the Command (⌘) and R keys. Release the keys when the Apple logo appears.
Partition your startup disk.
Before installing a previously-released version of macOS, you must first Partition your startup disk to Mac OS Extended (Journaled). Partitioning your startup disk permanently deletes all of the data stored on it. To begin, select Disk Utility from the macOS Utilities window of macOS Recovery, then select your startup disk. Be sure you are selecting the entire disk (not the volume name indented beneath it), then click Partition. Under Format, be sure to select Mac OS Extended (Journaled). When done, quit Disk Utility to return to the macOS Utilities window.
Restart into macOS Internet Recovery
Go to the Apple menu () and select Restart. Once your Mac restarts hold down the Option, Command (⌘) and R keys. Release the keys when the Apple logo appears.
Restore from your Time Machine Backup.
You will be presented with options from macOS Utilities. Select “Restore From Time Machine Backup,” then click Continue.
Select a backup.
Follow the onscreen instructions to specify which backup to use and begin the restore process. When selecting a backup, use the macOS version column to verify that you’re selecting the previously released version that you wish to restore.
Restore from your backup.
After you click Restore, Time Machine begins restoring your Mac to the way it was the day you created the backup, and before you installed the macOS public beta.
Copy any additional files.
After your restore is complete, copy the files from Step 1 back onto your system.
Connect your iOS device to iTunes.
Connect your device to iTunes using a USB cable and open iTunes.
Put your iOS device into Recovery Mode.
On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold the Sleep/Wake and Home buttons at the same time. Don't release the buttons when you see the Apple logo. Keep holding both buttons until you see the recovery mode screen.
On an iPhone 7 or iPhone 7 Plus: Press and hold the Sleep/Wake and Volume Down buttons at the same time. Don't release the buttons when you see the Apple logo. Keep holding both buttons until you see the recovery mode screen.
Learn more about using Recovery Mode
Restore your iOS device.
iTunes presents you with options to restore or update your iOS device. You’ll need to confirm that you want to set it back to its factory settings by choosing "Restore" and then iTunes will erase your device.
Activate your iOS device.
Once completed, sign in with your Apple ID from iTunes to activate your device.
Restore from your iOS backup in iTunes.
When iTunes prompts you to restore all of your information from a previous backup, choose the iOS backup that you created in iTunes before you installed the iOS public beta. Then select "Continue" and iTunes restore your device.
Restart your iOS device.
After your device has restored, it will shut down. Restart the iOS device and follow the onscreen instructions from Setup Assistant.