As you are experiencing the error code : 0000-1401 it indicates “The download of your firmware failed”.

For proper trouble shooting further follow the below steps:

• Reboot your router 
• After rebooting the router the firmware file will get downloaded 
• later follow the steps that appears on the SBC App screen 
• After trying  all these steps if the issue persists 
•  Reset the router and modem for a minute 
• Setup the SBC app from start

Could you also let us know the model number of the modem that been connected to W31?

Pls follow the  below  link to reset the W31 

http://arris.force.com/consumers/articles/General_FAQs/mAX-Routers-Factory-Reset