Hello and thank you for your answer,
unfortunately, that version appears to have an issue when using OpenVPN via a mobile connection. I can ping the hosts in the other network when connected via VPN from the CLI of the TRB 140 itself, but when attempting to ping the hosts from a device connected to the TRB via LAN, I get "From 192.168.2.1 icmp_seq=0 Destination Port Unreachable". This did not appear when using the newer firmware, strangely enough.