Are you sure it deregistered?
That sounds like it only updated to the current version firmware.
If it really isn't registered, register it again, and once your Amazon account and the 'Device Info' panel on your Kindle agree that it is registered, then just re-boot it.
If it is registered (both on the Amazon account page and in the 'Device Info' panel) -
then just re-boot it, the 'bridge' code will fix things up for you.
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