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Hi Mellow,
Do you have any further updates on this issue please? I've just encountered the same problem myself.
It appears the kernel on the TRB140 isn't compiled with 802.1Q support:
root@trb140:~# gunzip -c /proc/config.gz | grep 8021Q # CONFIG_VLAN_8021Q is not set
Just seen the new firmware you linked in the other thread - vlans now work correctly! Thank you!