iPhone Keeps Asking for Other People's Password
If you've recently setup or restored your iPhone from a backup, and it keeps asking for somebody else's iTunes account or Apple ID password, follow this guide to fix the problem.
The most likely reason this is happening is that you have songs (or apps) in your library from another person. When your iPhone restores from a backup, it steps through each song and if the song was originally purchased by someone other than you, it prompts you to login as that other person.
The above happens every time it encounters another song. That's why it seems like it keeps asking for the same password over and over again.
Fixing ItThere's two ways to fix this, besides erasing your entire iPhone and just starting fresh.
- Delete the affected songs
- Stop the in-progress restore
Delete the affected songs
This is the method I chose because I didn't want to have to deal with this again during my next upgrade.
Use the Track Down Purchases iTunes script for $1.99 on your Mac to find and delete the affected songs. Then, sync your old iPhone with iTunes, manually back it up, and then restore again from your new iPhone.
Stop the in-progress restore
Some have discovered that stopping the restore in-progress prevents these errors. This is likely because iOS stops trying to resolve the unauthenticated music. This Mac Rumors forum post goes into more detail about this solution.