Note: This downgrade procedure will paintings till Apple stops signing iOS 8.3. To test the signing standing of iOS 8.3, please talk over with IPSW.me/8.3. Also, you gained’t be in a position to use your Apple Watch should you upgraded it to watchOS 2, and downgrade to iOS 8.3. watchOS 2 calls for a paired iPhone operating iOS 9.
Step 1: Connect your iOS software to your pc and release iTunes
Step 2: Disable Find My iPhone by means of Settings → iCloud → Find My iPhone
Step 3: Place your tool into DFU mode: Hold Home + Sleep button for 12 seconds, and free up Sleep button whilst proceeding to hang Home. Once you're in DFU mode, iTunes will have to display a notification indicating so. Click OK.
Step 4: Click Restore iPhone adopted by way of Restore and Update
If you don’t have already got the iOS 8.3 firmware in your native device, iTunes will obtain it previous to updating. Otherwise, the repair procedure will start and also you’ll be again on iOS 8.3 in a few minutes.