Here is How You Can Downgrade Back to iOS 8.0

Yesterday Apple released iOS 8.0.1 and many users discovered after updating that the Touch ID functionality broke and/or they could no longer connect to their cellular service provider.

Follow these steps to reinstall iOS 8.0.

1. Make sure that you’re using the latest version of iTunes.
2. Connect your iPhone to iTunes.
3. Back up your iPhone in iTunes on your Mac or PC. iCloud backups won’t restore to earlier versions, including iOS 8.0.
4. Download the file below that corresponds to your device:
   • iPhone 6
   • iPhone 6 Plus
5. Select the file you just downloaded by doing one of these in iTunes:
   • Mac: Press the Option key and click Check for Update.
   • Windows: Press the Shift key and click Check for Update.
6. Press Update to install iOS 8 on your iPhone.