How to Downgrade iOS 11.2 Beta and Go Back to iOS 11.0.3 on iPhone
The reason I wrote this article is I encountered endless reboot loop with iOS 11.2 beta update, so I immediately decided to downgrade iOS 11.2 beta to iOS 11.0.3 before it causing irreparable damage to my iPhone. If you happen to have the same problem with me, I'd like to share my experience about how did I restore from iOS 11.2 to iOS 11.0.3 without losing data.
So I firstly tried iTunes as many people will do, but it prompted that "There was a problem downloading the software". After trying 3 times with no result, I resorted to another iOS System Repair Tool ReiBoot to remove iOS 11.2 beta from my iPhone 7, and it did successfully downgrade to iOS 11.0.3 without affecting my existing data. To my surprise, it also supports to downgrade iOS 12 on iPhone.
How Do I Downgrade iOS 11.2 without iTunes
Before you can uninstall iOS 12/11.2 on your iPhone, iPad, it's strongly recommended to make a backup in case of unexpected errors.
1. To begin with, you need to install Tenorshare ReiBoot on your PC or Mac and connect your iOS device with it. Then click Fix All iOS Stuck to move on.
2. Click Fix Now to download iOS 11.0.3 firmware online. As soon as the IPSW file is ready, Tenorshare ReiBoot will start to replace the software automatically.
3. When it finishes, enter your passcode and you will find that your device has been downgraded from iOS 11.2 to iOS 11.0.3.
Video Guide on How to Downgrade iOS 11.2 without Data Loss
So, this method works to downgrade iOS 11.2 to all public signed iOS firmware. Hope you can successfully go back to iOS 11.0.3 after reading this post.