question: How to change the VPN protocol on a router running ExpressVPN
answer: 
  This guide will show you how to change the VPN protocol on a router running ExpressVPN.
  
  VPN protocols are the methods by which your device connects to a VPN server. ExpressVPN recommends using the Automatic protocol option. It is selected by default and automatically chooses the protocol most appropriate for your network conditions.
  
  If you are unable to connect to the VPN with the Automatic option, you are recommended to try another VPN protocol.
  
  Note: All device groups will use the same VPN protocol.
  
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  Different types of VPN protocols