How does iphone downgrade the system?

1. Download the corresponding ios firmware to be brushed, such as ios 10.2. 1.

2. Install the latest version of iTunes on the computer, then connect the ios device to the computer, and then open iTunes. ITunes can successfully connect to your phone.

3. Press and hold "Shift" on the keyboard and click the "Update" function of iTunes;

4. According to the dialogue window popped up in iTunes, select the corresponding version of iOS firmware and click Update.

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Second, the DFU model has recovered.

Note: This degradation mode needs to enter DFU mode or recovery mode, which will erase all the data of the mobile phone, so everyone should back up the data of the mobile phone first, such as photos, videos and important short messages. Contacts don't need to be backed up, and iCloud will synchronize them automatically. If you are worried, you can download a QQ synchronization assistant to upload backup contacts.

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Operating steps:

1, put the phone in DFU mode.

The specific way to enter old devices such as iPhone6 is to press the power and Home buttons at the same time, and both buttons are pressed all the time. At this time, the phone will automatically restart, enter this mode and then release the button. Friends who don't know this mode can press more until the phone interface is black.

IPhone 7/8/8P/7P enters DFU mode: turn off the device first; Then quickly press and hold the power button for 3 seconds, and then continue to press and hold the power button and the volume reduction button 10 second after 3 seconds; Release the power button and hold down the volume reduction button until it is successful.

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2. If you successfully enter DFU mode, iTunes will pop up a notice to check whether the iPhone is in a recovery state.

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3. You can see that there is a restore button. Hold down the shift key of the keyboard, click "Restore" with the left mouse button, and then follow the prompts to find the path of the previously downloaded firmware and open it. Finally, iTunes will automatically start the recovery. Be careful not to unplug the data cable during this process.

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4. When 4.iTunes is restored, a window will pop up, the content is roughly "Your iPhone has been restored, and this window will automatically close after 10 seconds". Close this window and unplug the data cable. Then wait for the device to start for the first time and activate the device on the mobile phone.

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According to the above two methods, you can downgrade the Apple device in your hand.

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Hearing the overbearing words of "rolling back to the previous version", we can't help but think of the nightmare that Windows 10 brought us at the beginning of pushing the preview version. Now, this sentence is repeated on iOS 10. Since the release of iOS 10 Beta 2, we have heard a burst of bad news from early users.

Pressing unlock is not too much a problem for 33 years. What's more, some users of iOS 10 were locked by Apple ID when they started the two-step verification, and Apple officially has no solution for the time being. When I hear this, do you want to "roll back" to the embrace of iOS 9 immediately? The following strategies may help you!

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Step 1: Turn off the Find My iPhone function.

1. First, open Settings, click Avatar, and then click iCloud.

2. Click to enter the "Find My iPhone" option.

Just "turn off" the switch at the back after you go in.