question: How to restore the original firmware of a router running ExpressVPN
answer: 
  To use our apps and configurations, please sign up for an ExpressVPN account first.
  
  This guide will show you how to restore the original firmware of a router running ExpressVPN. Before you start, make sure to download the router’s original firmware on the official Asus, Linksys, or Netgear websites, or for Aircove from the ExpressVPN setup page.
  
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  Restore the original firmware of a router running ExpressVPN (v2 onwards)
  Restore the original firmware of a router running ExpressVPN (v1)
  
  Restore the original firmware of a router running ExpressVPN (v2 onwards)
  Sign in to your router running ExpressVPN.