If you switched to the operating system iOS 11 and realized that you absolutely do not like it, then you should not worry, since you can easily roll back your iPhone, iPad or iPod Touch to the previous iOS 10.3.3. In this guide, we’ll explain in detail how to do this. Let’s start.
Downgrade from iOS 11 to iOS 10.3.3
Rolling back to a previous version of iOS is relatively straightforward. The main thing is to follow everything that we will describe below.
Download the latest version of iTunes and install it on your computer or MacBook. This is very important, since it is extremely problematic to carry out a rollback without it. Next, download the iOS 10.3.3 IPSW file that will be associated with your Apple device.
Once you have the latest version of iTunes installed on your computer and the corresponding IPSW file downloaded, connect your iPhone, iPad or iPod Touch to your PC or MacBook using the Lighting Cable.
Now you need to enter Recovery Mode on your device. To do this, hold down the Power and Home buttons at the same time until the iTunes utility logo appears on the screen.
The note: iPhone 7 / iPhone 7 Plus owners will have to perform slightly different actions to enter Recovery Mode: press and hold the Power and Volume buttons simultaneously until the iTunes logo appears on the screen.
Ok, as soon as you complete the above steps, a notification from iTunes will appear in front of you, which will indicate to you that the device is now in Recovery Mode.
Hold the Option (⌥) key on your keyboard and click on the Restore button (PC users have to press the Shift key and click), and then select the IPSW file with iOS 10.3.3 that you downloaded earlier.
Next, click on the “Restore” button to start the process of rolling back your device from iOS 11 to iOS 10.3.3 directly. Once the rollback process is complete, you only need to set up your device as you did when you purchased it.
The note: If you backed up your device to iCloud or iTunes before switching to iOS 11, you can easily use it to return your iPhone, iPad or iPod Touch to its previous look.
A source: geekhow.ru