Firmware for Vantiva EWA1231 (aka Vodafone Power Hub)

I've just received Voda's new Power Hub, which is a rebadged Vantiva EWA1231 . Voda have helpfully locked down every setting in their GUI, even in 'Expert' mode so I'm looking to fix that so I can optimise it.

Vantiva say they use OpenWRT on their website, but I can't find anything about the device here. My intent os to reload it with some factory software that Voda haven't slapped their nanny-state locks all over.

Help anyone?

They use firmware based on some vendor sdk, derived from openwrt long time ago.
Can you show liink to firmware uopdates and/or bootlog from nanny ui?