Actually I have the same behaviour in failover mode, it simply does not work in the latest fw for me
only primary is used, if primary is down, none of the devices connected have "internet" until primary comes up.
2 x RUTX12 - and 3 unlimited 4G simcards with 3 different carriers, 3 external antennas, and I have still not added anything when it comes to performance or uptime - from what I can get thru sharing my phone's internet ....
This is the Most expensive experience or should I say - experiment.... with Teltonika.
- I started out with a RUT950 - I should just have kept that one .... at least it does what it's supposed to.