1. Restart your phone.
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2, Enter the mobile phone Settings - system upgrade to detect and update the system;
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3, enter the phone Settings -- more Settings -- restore factory Settings -- clear all data (please back up important files in the phone before clearing all data);
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4, if your mobile phone has root, it is recommended that you brush the firmware to restore the system first, you can go to the official website to download the firmware upgrade package to restore the system.
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5, can also be sent to the after-sales service center for professional staff to help you test.
This situation should be the line fell loose, this situation if he no longer commit it can be used normally, if you can only find maintenance personnel to help you reinstall the buckle