Cindy Murphy from Gillware has published a very interesting post on how to reset the backup password in iOS 11. Here is an excerpt from it:
“Apple’s help page about encrypted backups got an update when iOS 11 came out. They give the following advice for people who have forgotten their backup password:
You can’t restore an encrypted backup without its password. With iOS 11 or later, though, you can make a new encrypted backup of your device by resetting the password. Here’s what to do:
On your iOS device, go to Settings > General > Reset.
- Tap Reset All Settings and enter your iOS passcode.
- Follow the steps to reset your settings. Resetting your settings won’t affect your user data or passwords, but it will reset settings like display brightness, Home screen layout, and wallpaper. It also removes your encrypted backup password.
- Connect your device to iTunes again and create a new encrypted backup.”