The version number should be on the tag on your router. As far as your guest network goes, be sure to page down to the bottom of the screen and click "save".

If you are in the US keep the US model. If in CA keep that router.

If I understand, you connect the modem to the yellow connection of the router and you are not getting any internet. Try connecting a PC direct to the modem with an ethernet cable and see if you have...

Is 192.168.2.200 in your DHCP range? Try a lower number than 200. And power down and up your router and the device after your change.

If ethernet and WIFI both stop working, most times it is your Internet Service Provider (ISP). You can test it by connecting your PC direct to the modem for a while bypassing the router. If the PC...

If ethernet and WIFI both stop working, most times it is your Internet Service Provider (ISP). You can test it by connecting your PC direct to the modem bypassing the router. If the PC connects then...