We have a service partner that only can provide OpenVPN for connection protocol.
Do anyone know how to set this up in a firebox?
Here is an article for connection with an OpenVPN Client.
Use Mobile VPN with SSL with an OpenVPN Clienthttps://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/mvpn/ssl/mvpn_ssl_ovpn_profile_c.html
I am not aware of a document for a BOVPN from an OpenVPN server, but I would expect that it would work. Just make sure that the BOVPN settings match at each end.