Here's a complete tutorial on how to downgrade iOS 10.3 final version to iOS 10.2.1 on iPhone, iPad or iPod touch.
Latest Software Updates Might Not be For Everyone - Downgrade iOS 10.3 Right Now Before it's too Late
While the prospect of having the latest software update at all times sound to good to be true, but if you have an older device, then you might not share the same sentiments. Sure, Apple does support a lot of old devices so to speak, but some of them barely keep up in terms of performance, creating nothing more than frustration for the user during day to day usage.
With the release of iOS 10.3, it's fairly obvious that users with older devices such as the iPhone 5, iPad mini 2 or iPad 4 might want to reconsider their latest update jump. If you think the latest release from Cupertino is just isn't cutting it for you, then you will be pleased to learn that you have a limited window of opportunity at hand in which you can downgrade iOS 10.3 back to iOS 10.2.1. But how will you do that? Just follow the steps outlined below.
Downgrade iOS 10.3
Note: This process will erase everything off your device. Make sure you have taken an iTunes or iCloud backup beforehand.
1. Download and install iTunes on your computer from apple.com/itunes if you haven't already.
2. Now download the correct iOS 10.2.1 IPSW firmware file for your device.
3. Launch iTunes and connect your iPhone or iPad to your computer using a USB cable. Also make sure you have disabled Find My iPhone on your device. Navigate to Settings > iCloud > Find My iPhone to disable.
4. Select your device from top left hand corner and then click on Restore iPhone while holding down the left SHIFT key (Windows) or the left OPTION key (Mac).
5. Once a new pop-up window comes into view, just select the iOS 10.2.1 firmware file you downloaded in step 2.
At this point, iTunes will verify the firmware file with Apple. If everything was done correctly, the restore process will begin immediately. Once it is complete, you will see the first-boot iOS screen on your iPhone or iPad. Just set up your device and you are good to go.
There's no telling when Apple would stop signing iOS 10.2.1, making the downgrade impossible in the future. So, if you are having troubles with iOS 10.3 already, then it's best to make your move right now rather than later.
Do let us know in the comments section why you opted to downgrade iOS 10.3.
You may also like to check out: