Downgrade iOS 10 Final to iOS 9 – How to Tutorial
Here's how you can downgrade iOS 10 final / iOS 10.0.1 to iOS 9 running on iPhone, iPad, iPod touch. Hurry up as downgrade window is limited.
Downgrade iOS 10 Final to iOS 9 Now If You Want to Stay on Older Firmware
iOS 10 final has been unleashed for everyone out there with a compatible device. But the news is not rosy for everyone as users with older devices might see performance downgrade in some corners. If that's the case at your end then you might want to consider downgrading back to iOS 9 right away. Why right away? Because iOS 10 has been released officially into the public domain, which means Apple will stop signing iOS 9 at any given minute. Therefore, make the most of this opportunity if you want to regain those lost performance bits from your device.
Downgrade iOS 10 Final to iOS 9 Tutorial
First and foremost backup all your data to iCloud or iTunes as downgrading will erase everything off your device. Secondly, turn off Find My iPhone (Settings > iCloud > Find My iPhone) otherwise iTunes will fail to restore your device.
With those two things out of the way, let's begin!
1. Download the iOS 9 firmware file which Apple is currently signing. At the time of writing, it's iOS 9.3.5.
2. Once the download is complete, connect your iOS device to your PC or Mac using a USB cable and then launch iTunes. Make sure Find My iPhone is turned off at this point otherwise iTunes will toss you an error message.
3. Select your device from the top left hand corner of iTunes and then click on the 'Restore iPhone' button while holding down the left 'Shift' key (Windows) or left 'Option' key (Mac).
4. Point iTunes towards the iOS 9.3.5 firmware file you downloaded in step 1.
iTunes will now verify the firmware file with Apple and begin the restore process given you downloaded the correct IPSW. If you haven't, then iTunes will throw an error at you forcing you to download the firmware file again. But the right one, of course. Therefore, make sure you get it right the first time.
Once the restore process is complete you can start using your device as you normally would.
iOS 10 is packed to the rafters with a boatload of great features. But they might not float everyone's boat as new firmware releases tend to hinder older devices in terms of performance. If you're a victim of that, then downgrading is the way to go until Apple pushes out a further update to the newer firmware to get things right.