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Thanks guys - will check out that PDF
and it does go from "try again" to "updating now" when I plug the USB cable in... so maybe its not dead yet.
I'm fairly sure I've tried the USB cable on startup sequence and I've definitely tried hard-resetting > 10 times.
If I've nothing to lose, how about opening the case and disconnecting the battery for a while - would that force any different behaviour?
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