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===Preconfigured <code>config.txt</code>===
To install pwm fan, first add <code>dtoverlay=pwm-2chan,pin2=13,func2=4</code> to <code>/boot/firmware/config.txt</code> under [all] or the end of file and <code>reboot</code>:
'''PS''': You can skip this step due to '''X735 V1.0''' does not support PWM fans
sudo nano /boot/firmware/config.txt
Save & exit.