Restore iphone without updating os
If your i Phone isn't jailbroken, you can use the built-in Erase All Content and Settings tool.
It is recommended to use the cable that was originally included in the packaging of your i Phone so as to avoid any hardware issues during the process.Switch off your device then press on the power and home buttons for about 30 seconds.Release only the power button until the device is identified in i Tunes.Apple offers different options for you to be able to restore data to your phone.Apple's flagship music player, i Tunes, is one of such tools that may help you put the data that you want back in your phone.
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This way is the best way to restore your i Phone without updating i OS, and it's available for every i Phone user. You can choose to use i Tunes or i Cloud to get them backed up.