If you have an iPhone or iPad, you can downgrade iOS 11.0.2 to iOS 11.0.1, iOS 11 or iOS 10.3.3. Here's how you do it right away.
You Have Multiple Options If You Want to Downgrade iOS 11.0.2. Choose Wisely.
Quick update: Apple has stopped signing iOS 10.3.3. This means you can no longer downgrade to iOS 10. Your options are now limited to iOS 11 and iOS 11.0.1 only.
iOS 11.0.2 is now available for download, and it implements even more bug fixes. This update is good news for certain iPhone 8 and iPhone 8 Plus users who were experiencing crackling sounds during a voice call. But of course, those who are more interested in the fact if they can downgrade iOS 11.0.2 will be pleased to learn that they can do so right away. You can either go back to iOS 11.0.1, iOS 11 or even iOS 10.3.3. But mind you, since iOS 11 has been out for quite a while now, it's only a matter of time Apple stops signing iOS 10.3.3, shutting down the passage to go back to iOS 10 altogether.
Downgrade iOS 11.0.2.
Downgrading will erase everything off your device. Make sure you've backed up everything to a safe and secure location before proceeding.
1. Download the firmware to which you wish to downgrade to.
2. Now download iTunes for your computer if you haven't already. You can grab it from: apple.com/itunes
3. Connect your iPhone or iPad to your PC or Mac using a Lightning cable.
4. Launch iTunes, click on the little icon on the top left hand corner that looks like a little iPhone.
5. Now click on the Restore iPhone button while holding down the left Option key (Mac) or the left Shift key (Windows).
6. Select the IPSW firmware file you downloaded in step 1.
7. iTunes will now verify the firmware with Apple and restore your device. The entire process will not take more than a few minutes. Once it is complete, you can set up your device as brand new.
If you are downgrading to iOS 10.3.3, then I would highly recommend that you make up your mind about it immediately. There's no telling when Apple will stop signing the firmware, leaving you out in the cold. After all, iOS 11 is brand new firmware with certain bugs of its own which will be polished as time passes on. Therefore going back to iOS 10 is a great way to make things increasingly stable.
