If you have a previous backup of iOS 16
Connect your device to iTunes or Finder
Connect your device to iTunes using a USB cable and open iTunes (Windows) or Finder (macOS).
Note: If you have an Apple Watch enrolled in the watchOS public beta, restoring your paired iPhone to a previously-released OS version is not recommended as it will no longer pair properly.
Put your device into Recovery Mode
On an iPhone 8, or later: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button 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.
On an iPhone 6s and earlier 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.
See how to put iPhone into Recovery Mode →
See how to put iPad into Recovery Mode →
Restore your device
iTunes presents you with options to restore or update your 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 device
Once completed, sign in with your Apple ID from iTunes to activate your device.
Restore from your backup in iTunes
When iTunes prompts you to restore all of your information from a previous backup, choose the iOS/iPadOS backup that you created in iTunes before you installed the iOS/iPadOS developer beta. Then select "Continue" and iTunes restore your device.

Restart your device
After your device has restored, it will shut down. Restart your device and follow the onscreen instructions from Setup Assistant.
NOTE: If you have upgraded to macOS Catalina, you can restore your device using Finder. After putting your device into Recovery Mode, select it from Locations in the Finder sidebar.
If you don't have a previous backup of iOS 16
First, you need to download the .ipsw file suitable for your device below. Then follow the steps below to downgrade to iOS 16.6 without data loss.
- iPhone 14 Pro Max
- iPhone 14 Pro
- iPhone 14
- iPhone 14 Plus
- iPhone SE (3rd generation)
- iPhone 13
- iPhone 13 Pro
- iPhone 13 Pro Max
- iPhone 13 mini
- iPhone 12, iPhone 12 Pro
- iPhone 12 Pro Max
- iPhone 12 mini
- iPhone 11 Pro, iPhone 11 Pro Max
- iPhone 11
- iPhone XS, iPhone XS Max
- iPhone XR
- iPhone X
- iPhone 8
- iPhone 8 Plus
- iPhone SE (2nd generation)
- 11-in. iPad Pro (4th generation), 12.9-in. iPad Pro (6th generation)
- 10.2-in. iPad (10th generation)
- iPad Air (5th Generation)
- iPad mini (6th generation)
- 10.2-in. iPad (9th generation)
- 11-in. iPad Pro (3rd generation), 12.9-in. iPad Pro (5th generation)
- iPad Air (4th generation)
- 10.2-in. iPad (8th generation)
- 11-in. iPad Pro (1st and 2nd generations), 12.9-in. iPad Pro (3rd and 4th generations)
- 10.5-in. iPad Pro (1st generation), 12.9-in. iPad Pro (2nd generation)
- iPad (5th generation), iPad (6th generation)
- iPad mini (5th generation), iPad Air (3rd generation)
- 10.2-in. iPad (7th generation)
- 9.7-in. iPad Pro (1st generation)
- 12.9-in. iPad Pro (1st generation)
Connect your iOS device to iTunes
Connect your iPhone or iPad to a Mac or Windows computer with iTunes installed.
Note: If you have an Apple Watch enrolled in the watchOS 10 beta, restoring your paired iPhone to a previously-released OS version is not recommended as it will no longer pair properly.
Backup your device
Launch iTunes on Windows and Finder on Mac after your device is detected.
Select the option to back up all your data to your Mac or Windows computer, then click the "Backup Now" button.

Go to the backup folder
After your device has finished backing up, access the folder containing the backup file of your iPhone as follows:
With File Explorer on Windows, access the following path:
C:\Users\[your_username]\AppData\Roaming\Apple Computer\MobileSync\Backup
With Finder on macOS, access the following path:
~/Library/Application Support/MobileSync/Backup
Open your backup folder (eg 0000xxxxxxxxxxxxxx) with the last backup date. Then navigate to the Info.plist file and open it with an editor like Notepad or TextEditor (download from the Mac App Store).
Do some trick
Use the search feature (with Ctrl+F or Cmd+F) and find “Product Version”. At the bottom line will show the iOS version your device is running (17.0). At this point you just need to edit it back to 16.5 or 16.6 depending on the version you are using. Then save the changes (with Ctrl+S or Cmd+S).

Restore your device
Return to iTunes or Finder, hold down Shift key (on Windows) or Options key (on macOS) and click on "Restore iPhone/iPad" button. A file browser window will appear. Navigate to the downloaded .ipsw file and select it. Click on the "Open" button to start the installation process.

Activate your device
Once completed, sign in with your Apple ID from iTunes to activate your device.
Restore from your backup
When iTunes or Finder prompts you to restore all of your information from a previous backup, choose the backup that you created in the step 2. Then select "Continue" and iTunes restore your device.

Restart your device
After your device has restored, it will shut down. Restart the your device and follow the onscreen instructions from Setup Assistant.