==Preconfigured <code>config.txt</code>==
To install pwm fan, first add <code>dtoverlay=pwm-2chan</code> to <code>/boot/firmware/config.txt</code> or <code>/boot/config.txt</code> under [all] or the end of file and <code>reboot</code>:
sudo nano /boot/firmware/config.txt
Some OS's config.txt may be in the /boot/ directory, so that you need to run the following command:
sudo nano /boot/config.txt
Using <code>ls /boot/firmware/config.txt</code> you can check if the file is in the /boot/firmware/ directory
Save & exit.
sudo reboot
PS: Only appending to the last line not replace.
===Install gpiod package===