How does Apple's mobile phone drop back to the official version of ios?

Before you start, if you have backed up before upgrading iOS9, or there is no important data on your mobile phone, you don't need to back up. If there are some important information on the mobile phone, such as address book, SMS and photos, which are not backed up, it is recommended to back up first.

In general, it is recommended to use iTunes software on your computer for backup, which is more comprehensive. In addition, you will also use iTunes software when you brush your computer, so if you don't have it on your computer, please go to Apple official website to download and install it first.

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Step 2: Return to iOS8 system.

Next, we need to go online to download the latest version of iOS8, the latest version is iOS8.3, as shown in the figure. There are many websites on the Internet that provide iOS firmware downloads. Here I take Weifeng.com as an example. In addition, when downloading the firmware, you need to download the corresponding version of the iPhone, otherwise it will not work.

When the firmware is ready, you can start to downgrade iOS9. First, please connect the iPhone to your computer and open the iTunes software.

Then, please press and hold the power button of iPhone, and when the power off option appears, please slide it off.

Then, please follow the following steps to put the phone into recovery mode: first, please press and hold the power button to turn it on, and the Apple logo will appear on the screen. Do not release the power button; Second, then press and hold the Home button on the home screen until the screen turns black. Second, when the screen is black, please release the power button, and don't release the Home button of the home screen until iTunes on the computer side detects that an iPhone in recovery mode may make the partner who is operating for the first time feel strange, so try it several times.

Next, please click the "Restore iPhone" button in the window, as shown in the figure below.

Then, please select the iOS8 firmware we downloaded earlier. Note that the firmware here must end with ipsw.

Then we will be prompted whether to continue to do this. If we continue, all data on the iPhone will be erased. Click the Restore and Update button to continue.

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Then please wait patiently for iTunes to extract the firmware and restore the iOS8 system to the iPhone. After the downgrade is successful, we can activate the mobile phone.