Waking up old thread - to clear any ambiguity for the 400 owners who are unsure if this works...
The airbag fault on low battery does still occur with the latest firmware installed - if less or not I cant say.
The Foxwell 630 plus setup for Daewoo Epic / Tosca fix, as previously described does indeed work.
My aircon also started working again, albeit more down to luck than judgment.
Still saved me a 2 hour trip to the dealer and many thanks to all that contributed on this topic!