To troubleshoot a router that is incompatible with your Internet service provider, try the following steps:

1. Ensure that the router is compatible with your Internet service provider, and check for model numbers and other identifying information.
2. Perform an internet speed test and take note of the results.
3. Ensure that you are connected to the router by wire or wireless, and confirm the signal strength.
4. For wireless connections, ensure that the SSID (Wireless Network Name) is set correctly.
5. Check that the router is connected to your modem, and perform a reboot if necessary.
6. Ensure that the router is not in a location that will block the wireless signal.
7. Verify that the router's firmware is up to date.