You can downgrade iOS 14 / iPadOS 14 final back to iOS 13 / iPadOS 13 for an extremely limited time on your iPhone or iPad.
Not everyone is going to find iOS 14 or iPadOS 14 in the same taste. Some might find App Library a little too much, while some are going to see hammered performance or bad battery life on older devices like the iPhone 6s. After all, this is the first ever build of Apple's brand new software update, so these things are to be expected.
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If you find yourself in a situation where you think that you might have made a mistake updating to iOS 14 or iPadOS 14, then don't panic as you still have time to go back to iOS 13 or iPadOS 13. But this is only possible as long as Apple is signing the older firmware. Given that iOS 14 and iPadOS 14 are still in their infancy, therefore you have ample amount of time to make a decision.
Step 1. Connect your iPhone or iPad to your PC or Mac using a Lightning or USB-C cable.
Step 2. Launch iTunes or Finder.
Step 3. Click on the tiny iPhone-like icon on the top left hand corner of iTunes. Mac users can select their device from the left hand bar in Finder.
Step 4. Click on the 'Restore iPhone/iPad' button while holding the left Option key (Mac) or the left Shift key (Windows).
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Step 5. Now select the iOS 13.7 / iPadOS 13.7 IPSW file.
Step 6. Let iTunes or Finder extract the firmware and restore it onto your device. This may take a while so let it happen without any sort of interruption.
Once the restoration is complete, you can either set up the device as brand new or just restore a backup you created using iTunes, Finder or iCloud. If you are planning to sell the device, then you don't have to do anything after step 6. Just pack the iPhone or iPad up and send it out.
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