How do you disable alarm on rover 414?

To disable the alarm on a Rover 414, insert the key into the ignition and turn it to the "On" position without starting the engine. Then, press the alarm button on the remote or use the key fob to unlock the doors, which should deactivate the alarm. If the alarm persists, disconnect the car battery for a few minutes and reconnect it, which may reset the system. Always refer to the vehicle's manual for specific instructions related to your model.