Assuming your serial number ends '2157', then the reason you're running an older firmware is because the hub is not talking to the management platform for some reason.
I've reprovisioned the hub at this side so try factory resetting it by inserting somethign into the pinhole at the rear of the device until the status light flashes green.
Allow 5-10 minutes or so for everything to come back up and then you should see the latest firmware pushed to your device over the coming days.
Plusnet Product Team
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