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''' PWM fan control''' （This is optional）
PS: You can ignore this step if you don't use the 3-Pin PWM fan to cool the CM4, in . In fact, the [[C235]] passive cooler can provide enough cooling capacity, and you can also avoid the trouble of fan noise, it is included in [[NASPi CM4-M2]] and [[NASPi CM4-2.5]]
Run the below command to get the fan running.