If Vilfo is connected to another router an IP collision may occur as the other router/modem might use the same IP span as Vilfo's default values.
To resolve the IP collision please follow these steps:
Unplug the ethernet cable from Vilfo's WAN port
Connect your device via wireless or cable to Vilfo again.
You should be able to visit http://admin.vilfo.com now. If that doesn't work, you have probably changed the DNS servers on your device. If that's the case, please try to visit http://192.168.0.1 in your browser.
You'll see a message that Vilfo does not have an internet connection. Under the image, click on "change subnet" and change the IP address to 10.220.0.1
Connect the ethernet cable to Vilfo's WAN port again.