There are many factors that may cause the phone connection failed. It can be the driver installation on your computer, any software may interfere the connection, the firewall and anti-virus software, etc. It can also be your phone system or USB cable issue, etc.
If it is convenient for you, we can arrange remote assistance for you. Our engineer will help you locate the issue and fix it by remote assistance.
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Wondershare support will be happy to help!
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