THe image you posted is from:
http://www.orangepi.org/orangepiwiki/index.php/Orange_Pi_5_Plus#How_to_use_the_cooling_PWM_fan
- So you would need to decompile the file,
- edit this section to your needs:
rockchip,temp-trips = <
60000 1
65000 2
70000 3
75000 4
80000 5
>;
- recompile it and replace the old one
First of all you make a backup of your system before we trying to edit this.
Assuming the dtb is in /boot/dtb/rockchip/ you do following:
sudo apt install device-tree-compiler
sudo dtc -I dtb -O dts -o /tmp/orangepi5plus.dts /boot/dtb/rockchip/rk3588-orangepi-5-plus.dtb
Then edit the file /tmp/orangepi5plus.dts, e.g. with nano.
Then copy it back and reboot
sudo dtc -I dts -O dtb -o /boot/dtb/rockchip/rk3588-orangepi-5-plus.dtb /tmp/orangepi5plus.dts
sudo reboot