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Loopy,
Just press in the centre button of the navigation control as soon as you see the initial splash screen, and keep it pressed in until the screen flashes white. It can take a while - 20s or so - for this to occur. It's important not to let the button go until the screen flashes.
You have the "update_kernel" file in the root of the SD card, yes?
You don't need to use a separate SD card for this from the one that you have your books on, by the way. Nothing on the card is affected by this.
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