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It sounds like a bit of buggy code in the Sudoku application you installed. Something like that can bring a system down, which is why it's recommended that you backup your device prior to installing an application, especially if you are prompted with a warning about OS compability.
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Originally Posted by vanydotk
Is there anyway to do a clean install on PDAs? Like.. format it and just reinstall the OS?
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Yes, it's called a hard-reset (which, according to your descriptions, is what just happened).
To my understanding, the sequence for initiating a hard-reset manually on your hw6515 is to hold down the power button and insert your stylus into the soft-reset hole simultaneously. Your manual should contain additional details.