caution:Restoring the factory-set defaults returns all of the product and network settings to the factory defaults. The procedure then automatically restarts the product.
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On the product control panel, press (X451 Series) or touch (X551 Series) the Setup
button.
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Scroll to and press or touch the Tools menu button.
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Scroll to and press or touch the Restore Factory Defaults button, and then touch the OK button.The product automatically restarts.