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JS-DS-004 MDVR USER MANUAL
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Check SIM card status, make sure network and talk/sms services to support with enough fee.
Server Questions
Why can't connect to servers when the MDVR is running?
Make sure 3G/4G has dialed up successfully.
Check if server config correct at local menu, such as IP, port, and ID being unique.
Check if there's online vehicle to confirm if server is working normally.