The public beta of earlier required a paid developer that costs $99 a year, is now available for free to all s. Additionally, the public beta can also be easily accessed right from the iPhone Settings app, without needing to a configuration profile.
The before upgrading to iOS 17 beta. This step is important, since iOS 17 backups can't be restored to iOS 16. If s don't have a backup, they will need to set up their iPhone from scratch. In this case, it makes sense to sync all important files to iCloud before downgrading.
How To Downgrade From iOS 17 To iOS 16
The steps to downgrade to iOS 16 are the same on Windows and Mac, except that s will need to use iTunes for the latter. A Lightning to USB cable is also required for connecting the iPhone to the PC. Before getting started, s should ensure that their Mac is updated to the latest version of macOS, and the iTunes app is updated to its latest version on Windows.
Next, connect the iPhone to the computer. Finder should automatically open on Mac, and iTunes on Windows. If not, open the programs manually. Now put the iPhone in recovery mode by following these steps: press and quickly release the volume up button. Next, press and quickly release volume down. Finally, press and hold the side (power) button until recovery mode appears on the screen (black screen with a computer and Lightning cable).
Click on the 'Restore' button on the screen, which will erase the iPhone and install the latest version of iOS 16. If the takes longer than 15 minutes and the recovery screen disappears, s should let the finish, and then put the iPhone in recovery mode again by following the steps above.
Once the restore is complete, enter the Apple ID and . s can now set up their iPhone from an iCloud or local backup. If s don't have a backup, they will need to set up their iPhone from scratch. Once the iPhone is running iOS 16 again, it will continue to receive all remaining iOS 16 updates until iOS 17 is released in the fall.
Source: Apple