After the factory reset, connect the modem to the computer through a direct connection. Make sure that the second port is not connected to any other devices.
In this case the modem having solid blue LED on the front panel and also you confirmed that your modem is giving Internet service so you can try power cycling modem for a minute then also restart the router after the device reboots completely you can try connecting router to the modem ethernet port 1 and check for the internet. If still same issue persist you need to check with your router manufacturer for further trouble shooting.
After the factory reset, connect the modem to the computer through a direct connection. Make sure that the second port is not connected to any other devices.
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