Apple iphone software Flash-back using itools repair method

The first step, after installing the itools on the phone, we click on to open itools find "more" and then find "Flash repair" click (Recommended reading: IPhone6 plus how to install software?).

The second step, in the "flash repair" then we will see the software installed on the phone, we choose to repair a new app click Repair.

PS: One thing to be aware of is that we'd better fix the flash-back under the WiFi network, because sometimes the software version has a problem and it may need to download the latest version of the update Oh.