What should I do if the iphone6s application flashes back?

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Enter iTools > toolbox > fix flashback/authorize.

Or use AISI assistant to repair the flashback.

After plugging in the Apple device, select the Apple device on the left, and a set of icons on the lower right will flash back with a repair application.

A common reason for flashback is that the corresponding description file is not installed (it is XML of device security policy and restrictions, network settings, etc.). ):

There is a "profile" under Apple Devices > Settings > General > VPN. After entering the description file, select the corresponding consent.

If there is no VPN, it will appear after using iTools to repair flashback/authorization.