analysis of causes
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Confirm whether the WiFi hotspot of the recorder can be found in the wlan of the mobile phone system setting. If it can be found and connected successfully, please check whether the APP has the permission to obtain WiFi information through the mobile phone setting.
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Mobile phone Bluetooth or car Bluetooth device and recorder wifi will cause interference, it is recommended to turn off mobile phone Bluetooth or car Bluetooth device when the mobile phone connects to the recorder wifi.
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Phone Settings turn the wlan off and on again, or restart the phone and recorder and try to connect again.