Pandigital Novel Allwinner freezing after starting

Hi all,
I've had this tablet for a long time, and have rooted it; but recently I put an application on that seems to have had a bad effect. It freezes after starting. (I've forgotten the name of the application I installed.). It could also be because I overclocked it too high or some setting I changed, I'm not really sure.
I have tried the various remedies suggested on the net, i.e. holding power and up volume buttons, until restart, followed by wiping the cache and factory resets. Nothing...

Pandigital Novel Allwinner freezing after starting

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