Hmmm well after reading a bit more on the subject, I am tempted to upgrade the firmware and downloading 2760 from the link you posted as I type.
The post you link to does not mention about the unit version. Does it matter what version I have?
Also, how true is "...if your car was registered in June 2007 onwards you *should* have an L Revision gateway or higher"? Mygti.com mentions MY07 cars may experience power drain issues but mine is a MY57 so should it be OK?