How to downgrade iOS 11 to iOS 10.3.3.
Step 1: Download the iOS 10.3.3 ipsw files from the links given below:
Step 2: Make sure your computer is having latest version of iTunes. If not download and install from iTunes.com or upgrade if the program asks for the same.
Step 3: Turn off the Find My iPhone
Navigate to Settings => iCloud => Find My iPhone => Find My iPhone and turn it Off. Authenticate with the iCloud password when prompted.
Step 4: Using a certified cable connect your device to the computer and wait until iTunes launches automatically. If iTunes tells to upgrade do it first.
Step 5: Put your device in DFU mode.
All models prior to iPhone 7 => hold down the Power and Home button for 10 seconds, then release the Power button while ensuring Home button is still pressed. The device will enter into DFU mode and iTunes will provide an alert saying that it has detected a device in Recovery Mode.
How to put iPhone 7 or 7 Plus in Recovery / DFU Mode
Turn off the phone press and hold the power/lock button for 3 seconds. Don’t release now also press and hold the volume down button. Keep holding both buttons for approximately 10 seconds. After approximately 10 seconds, release the power/lock button, but keep pressing the volume down button for further 5 seconds. After few seconds you will see iTunes to display that an iPhone in recovery /DFU mode is detected.
If Apple logo appears on the screen, or iTunes logo with Lightning cable appears on screen, it means that the volume down button was pressed for too long. In these cases you have to re-start the process again.
Step 6: In iTunes window click the Restore iPhone… while pressing and holding the Option / SHIFT key. The computer will ask to select the ipsw file. Select the iOS 10.3.3 IPSW file from computer that and click OK. iTunes will start the downgrade process, just wait and let the process of restoring to iOS 10.3.3 to complete. Just set up your device as a new device or you can also restore from any back up if you have before.
If you are on iOS 10.3.3 then we recommend to keep your version because if the jailbreak for iOS 10.3.3 is released you shall be in the lucky persons. You can check current jailbreak availability on this page titled Can I Jailbreak?
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