With thanks to a forum member (some well deserved karma added) I have "downgraded" my Cybook to 538 and it is now working again.
I noticed that 538 is nearly 16MB whereas 685 is only just over 6MB. That's a big difference. Maybe this latest update should only be applied after 538 has been applied.
I will now attempt to re-flash 685 and see how it goes.
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