How to Restore Iphone to Previous Ios?

From a backup in iTunes

• Download the IPSW file for your device and iOS 11.4 here.
• Disable Find My Phone or Find My iPad by heading to Settings, then tapping iCloud, and turning off the feature.
• Plug your iPhone or iPad into your computer and launch iTunes.
• Hold down Option (or Shift on a PC) and press Restore iPhone.

How do I go back to previous iOS?

How to Go Back to a Previous Version of iOS on an iPhone

1. Check your current iOS version.
2. Back up your iPhone.
3. Search Google for an IPSW file.
4. Download an IPSW file on your computer.
5. Open iTunes on your computer.
6. Connect your iPhone to your computer.
7. Click on the iPhone icon.
8. Click Summary on the left navigation menu.

Can I downgrade iOS?

Not unreasonably, Apple doesn’t encourage downgrading to a previous version of iOS, but it is possible. Currently Apple’s servers are still signing iOS 11.4. You can’t go back any further, unfortunately, which could be an issue if your most recent backup was made while running an older version of iOS.