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Sometimes the RCD 300 has power, the code is correct, but the buttons are unresponsive, or the display is stuck. This is a firmware glitch, not a code issue.

How to hard reset the RCD 300 (Forced Restart):

Use this if the screen is frozen, buttons don't respond, or "SAFE" is flashing but you haven't entered a code yet.

Before attempting any reset procedure, adhere to the following safety guidelines:

This is the most effective "nuclear" reset for the RCD 300 Top model. It cuts all power to the internal memory, forcing a fresh boot.

If the previous owner lost the card and you cannot find the serial number by holding "SCAN" + "EJECT":

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