1. We can search the iOS8 system Baidu and then find the iphone5 version of the corresponding iOS8 firmware system.
2. Now turn on the computer and upgrade the itunes software in the computer to the latest version, and then we'll have the iphone IPad ITouch connected to the computer to open itunes.
3. Hold down the keyboard shift (up key) + left mouse button click on itunes Update restore function (figure)
4. In the open itunes need we choose to download the iOS installation files in the computer, we choose to click again-click Update-Wait for itunes to run.
5. Wait for the itunes upgrade success will pop up a success, and then we go back to iphone5 mobile phone into the activation of the operation can be.
Friendship tip: Because it is still a test version, so there is no OTA upgrade mode Oh, only download system files and then install the system, which will cause all the data lost in the phone oh, so we try to back up the data in advance.