Ports set open, not open.
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Solved by Windows7ge,
Looking up the modem it looks to be just that. I don't see any information saying it acts as a router or has you traverse NAT. This is a common cause of port forwarding not working. Also Carrier Grade NAT but that seems to be a lot more commonly seen with LTE routers.
Are you checking if the ports are open with your public IP or are you using a service such as no-ip? Are you certain you're testing the correct IP/port number? Are you certain you've opened the correct port? Are you testing ports 8080&8081?

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