Below the left hand side of the screen on the bottom is a hole. Use a paper clip and push it into the hole and hold. Lightly hold. This will reset the 4250 to factory defaults. This is the only thing i can find, short of taking out the battery and trying the reset then.
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Below the left hand side of the screen on the bottom is a hole. Use a paper clip and push it into the hole and hold. Lightly hold. This will reset the 4250 to factory defaults. This is the only thing i can find, short of taking out the battery and trying the reset then.