Select Settings-General-Access Restrictions-Install Application (literally translated into English), which means Settings-General-Restrictions-Install Application, just set the option to on.

First of all, after the mobile phone is connected to the computer with a data cable, the device model will be displayed in the lower left corner.

If it is not displayed, there is something wrong with the data cable.

If possible, please install Flashback Repair first, and then try again.

What should I do if I can't open the iPhone software?

When the software can't be opened, turn off the phone, restart and try again.

Use some software with flashback repair function to repair, and use the flashback repair function above to repair.

Software update failure caused by.

It is because of downloading on Apple's third-party application platform that some software downloaded by Apple for the third time caused this problem. Delete the software that can't be opened, and then download it directly in iTunes or directly in the mobile App Store.