I also have this problem.
After a power failure, I can no longer access the Zyxel.
When I connect to it, it gives me an IP that is about 30 digits long. I don't know what's wrong. Once again a device for the bin.

Try resetting the router once. To do this, press the reset button for more than 5 seconds to restore the factory settings. The default setup address should be http://192.168.1.2, with password 1234. Please note that if you change the suffix in the network, for example from 192.168.1.0 to 192.168.50.0, the setup address will also change (in the example this would be 192.168.50.2 or 1). It is best to check which IP address your computer currently has in the network.