Any how to for applying the 3705 fan?

@Spikerguy, @numbqq
I tried to do as directed in the thread https://forum.khadas.com/t/5-7x-version-issues/9831/10. So need to edit /sys/class/thermal/thermal_zone0/trip_point_3_temp

Ran into permission error, tried chmod 777 for the file, now get:

[aurion@neurofire ~]$ sudo -i
[sudo] password for aurion:
[root@neurofire ~]# echo 60000 > /sys/class/thermal/thermal_zone0/trip_point_3_temp
-bash: echo: write error: Input/output error

I can view the contents of the file (80000), but cannot write

Also tried:
echo 45000 | sudo tee /sys/class/thermal/thermal_zone0/trip_point_3_temp
which also doesn’t work

Also tried:
[root@neurofire ~]# echo 1 > /sys/class/thermal/cooling_device2/cur_state
[root@neurofire ~]# echo 2 > /sys/class/thermal/cooling_device2/cur_state
[root@neurofire ~]# echo 3 > /sys/class/thermal/cooling_device2/cur_state

However the fan does not do anything, but then again temperature is not 80C and apparently it is always on auto

It really does get hot!