I cannot connect.

If you can see the router’s Wi-Fi but cannot connect, first check that you are using the right Wi-Fi name and password.

Try the following

check the password and try again
“forget” the Wi-Fi on the phone or computer and connect again
restart the device you want to connect
restart the router
connect close to the router
test both 2.4 GHz and 5 GHz if both networks are available

If you are connected but the internet does not work

Then the problem is probably not the Wi-Fi connection itself. Check instead:

that the SIM card is active
that there is data left
that the router has contact with the mobile network
whether roaming is switched on, if needed
that the signal light is not red

If nothing helps

If you have previously changed the Wi-Fi name, password or other settings, you can try a factory reset of the router.

Remember that a reset returns your own settings to the defaults.

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Nicklas Knall