How to: Revert back iOS 8.0.1 update to iOS 8.0 in your iPhone 6 + Apple Devices

  • After that click on “check for Update “

Note : You need to press the Option key (if you are using MAC) or Ctrl key ( On windows) to display the update

ios 8.0.1 revert back -2

  • It will display a window where it asks you to select the firmware ( .ipsw), there you go select the file you downloaded in earlier step from and click OK
  • Now your device will be restored to original iOS 8 rather than iOS 8.0.1, and none of your settings or data will be erased or changed, just you are  downgrading

Still if you are facing some problems in downgrading to earlier iOS 8, you need to try full restore using Recovery mode

source: RENE RITCHIE (TWITTER) | Via : Verge