In reply to:

It is possible to update the flash kernel, but if the process goes wrong you'll need a serial debug lead to attach to J2 inside the central

And before anyone actually tries messing with this, I wanted to say that the "serial debug lead" that Hugo talks about is not just a couple of pins that connect to a serial plug. It's actually a little custom-made device with electronics on it. So it's not a good idea to try messing with the pins unless you've got one of these special devices.
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Tony Fabris