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When “Disconnected. Please contact your ISP for help.” is shown on the page as below, try the 
following methods: 
−  Modify the MAC address of WAN port by referring to Change the MAC address of the 
WAN port. 
−  Use another device to configure the router again. 
−  Ensure that your internet service does not expire. 
If the problem persists, contact Tenda technical support.