NCT Group i30sx - Manual (Page 166)

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5. Let the radio product, battery dry, and SIM card for 72 hours before
reconnecting the battery and/or powering on the radio product.
If the radio product does not work after following the steps listed above, contact
your dealer for servicing information.
Clean the external surfaces of the radio product with a damp cloth, using a mild
solution of dishwashing detergent and water. Some household cleaners may
contain chemicals that could seriously damage the radio product. Avoid the use
of any petroleum-based solvent cleaners. Also, avoid applying liquids directly
on the radio product.