To make VPN working, several things need to be setup. This page is just the VPN client setup for Android devices. For VPN server setup, please refer to this page.
Download OpenVPN Client for Android device here
Back to your Firewalla App, in VPN settings page, click "Download OpenVPN Profile", save .ovpn file(client profile for OpenVPN) on your android phone’s local storage. Please also note down the ‘Password’, which will be used later.
Open the OpenVPN app on your android phone which you just installed. Then click ‘OVPN Profile’ on the bottom.
In the ‘Import Profile’ page, find and select the .ovpn file that you previously downloaded from Firewalla. Then click the ‘IMPORT’ button on the right up corner.
Click ‘ADD’ button on the right up corner.
Toggle on the switch button to connect.
Finally, input the password that you previously see in Firewalla app. If you forget the password, you can take a look at it again from Firewalla app.