This is of vital importance because i Tunes will automatically start downloading the latest version of i OS after the restore, even you have clicked “Cancel” in previous popup dialog.Hence, you must unplug i Phone immediately to present i Tunes from downloading the latest i OS firmware file.Choose Backup & Restore, you will find the previously backup file. Select your i Phone at the top of i Tunes and go to Summary tab.Click Restore icon and confirm to restore from this backup file. In “Backups” please select “This Computer”, and then click Back Up Now button to create a new backup of your i Phone to computer. Disconnect i Phone from computer after the backup process completes. Open i Phone Settings, go to General, and then click Reset. After your i Phone has been reset, you will see “Slide to set up” message appears on i Phone, please do not start the process.Hope the two methods give you some clues when comes to restore i Phone/i Pad without updating i OS.
After restoring, your i Phone will be restored to original i OS, instead of updating to the latest i OS. If you prefer to use i Tunes, please refer to method 2 that I will elaborate below. Tap “Erase All Content and Settings” in the popup options and confirm. Instead, plug it to your computer and open i Tunes. When i Tunes detects your i Phone, you may receive a message saying “An update to the carrier settings on your i Phone is available”, click “Download and Update”. After this, you will be prompted to restore your i OS device.
Please select the backup file that you just created and wait for the restore process to complete. Do disconnect your i Phone from computer immediately once the restore is completed.