Follow the on-screen instructions to set up your device, and restore from the iOS 10.2.1 backup or start afresh. Step 8: After your device is successfully downgraded from iOS 10.3 to iOS 10.2.1, you should see the white ‘Hello’ screen on your device. It will take some time for the process to complete so stay patient. Step 7: iTunes will now verify the software and install it on your device. Click on the Next button, followed by the Agree button to continue. ![]() Step 6: In the next screen, it will give you information about the iOS 10.2.1 update. Step 5: Then click on the Restore and Update button to continue. Step 4: Browse and select the iOS 10.2.1 IPSW file that you downloaded in Step 1. Step 3: Hold the Alt/Option key on Mac or Shift key in Windows and then click on the Restore iPhone… (iPad/iPod touch…) button. If you don’t see the popup, try the process of holding the buttons again.
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