How to restore Apple's mobile phone system to ios8.2?

1 Before starting, if you have backed up before upgrading iOS9, or there is no important data on your 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.

2

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.

The answer is not easy, I hope I can help you, please help me adopt it if you are satisfied, thank you!