6. Restore in iTunes

If there was no update—or even if there was—restoring your iPhone or iPad using iTunes can sometimes shake loose bad bits that even a hard reset or iCloud restore can't. That's because iTunes offloads your data, restores the operating system, and then reloads you data. Think of it as spring cleaning.

  1. Make sure you have a recent iTunes backup. Make it encrypted so all your password and other private data is preserved.
  2. Launch iTunes on your Mac or Windows PC
  3. Plug your iPhone, iPad, or iPod touch in using your USB to Lightning or USB to 30-pin Dock cable.
  4. Click on the device icon at the top left to go to the device tab.
  5. Click on Check for Update in the Summary pane.
  6. Click on Download and Update

  7. Agree to the Terms and Conditions.
  8. Enter the Passcode on your iPhone or iPad, if prompted.

When you're all done, try connecting to Bluetooth again. If it works, huzzah. If not, there's one last thing you can try...