Does anyone know how to factory reset the cubes? I pressed the button but it doesn't indicated its been reset.
I don't think that will help. Their IP will reset to 192.168.1.254:8000 but that is likely already what their IP is at... you just can't see them because you are not on 192.168.1.x with your router.
Have you tried this? Sounds like it should make it work.
You gotta login to the router, click advance settings, then DHCP settings, change the LAN IP to 192.168.1.16 as VM reserve the IP's upto .15 for guest networks.
The router will now reboot, login to the router again and change the LAN IP to 192.168.1.1 and take it from there!