undo typing in Notepad (iphone 4 runing iOS6 jealbreaked)

[kilog]

Hi,
while driving I accidentally deleted over 1000 characters of caracters in Notepad application on Apple 4 runing iOS6 jealbreaked.
how can I do to exit without saving and return to the latest version (just before my idevice was closed)
it happened this morning, and since that time I keep notepad open pending a solution
If i shake the iDevice will it be enough?
thank you for all

 

[T5BRICK]

Um. It depends on how you deleted them. Try shake to undo?

 

[kilog]

I tried but the result was not significant just 2 or 3 words. Also while shaking my fingers touched the virtual keyboard and now even if i shake with all my force nothing happens