Apple has released iOS 8.1.2, which includes a fix for a bug experienced when using ringtones purchased from the iTunes Store.
What’s New In This Version:
This release includes bug fixes and addresses a problem where ringtones purchased through the iTunes Store may have been removed from your device. To restore these ringtones, visit itunes.com/restore-tones from your iOS device.
For information on this update, please visit:
iOS 8.1.2 is available to download OTA (Over The Air) from your device itself, by heading to Settings > General > Software Update.
If you wish to download the .ipsw firmware file, download links are available at the following page – Downloads