Navigate a web browser to the 192.168.100.1 IP address. Click the “Device Status” button located immediately below the password entry text box. This should show you the device specification and Firmware Version.

Hope this helps.

Thanks sjtnet. 

Is there a way to see if I have an update? And how? 

Firmware depends on the ISP as all certify different versions for their service. so you won’t find a list of what is current. And the firmware is part of the provisioning from the ISP. So if its working, it should be fine.