Sometimes, a previous owner set a custom code (not the factory default). A calculator cannot guess a custom code. If you enter the wrong code 3 to 5 times, the radio will display or "MISCODE."
If your Kenwood radio displays "PROTECT" or "CODE," it has likely triggered its anti-theft system. Before you pay for a reset, try these steps:
Follow the calculator's instructions to input your radio's details. This may involve selecting the model, entering the serial number, and providing the security ID.