Disable POE on MikroTik RouterBOARD 962UiGS-5HacT2HnT

Hi I'm using OpenWrt 19.07.5, r11257-5090152ae3 on the mikrotik router.

After I fried the second usb ethernet adapter I noticed that I was connected to port 5 of the router which is the poe out port. So I measured the pins on the plug and noticed i have 9V on a couple of them.
So I assume that this is destroying the adapters.

When I check the gpios I notice that one is responsible for poe, at least that is what I'm thinking

oot@mikrotik:~# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-31, parent: platform/ath79-gpio, ath79-gpio:
 gpio-3   (                    |POE power           ) out lo
 gpio-12  (                    |rb:green:user       ) out lo
 gpio-13  (                    |USB power off       ) out hi
 gpio-20  (                    |Reset button        ) in  hi

gpiochip1: GPIOs 488-511, ath9k-phy1:
 gpio-489 (                    |ath9k-phy1          ) in  lo

So I changed its value

oot@mikrotik:~# ls -ahl /sys/class/gpio/gpio3/
drwxr-xr-x    2 root     root           0 Jan  1  1970 .
drwxr-xr-x    4 root     root           0 Jan  1  1970 ..
-rw-r--r--    1 root     root        4.0K Feb 16 20:52 active_low
lrwxrwxrwx    1 root     root           0 Feb 16 20:52 device -> ../../../gpiochip0
lrwxrwxrwx    1 root     root           0 Feb 16 20:52 subsystem -> ../../../../../../class/gpio
-rw-r--r--    1 root     root        4.0K Feb 16 20:52 uevent
-rw-r--r--    1 root     root        4.0K Feb 16 20:52 value
root@mikrotik:~# cat /sys/class/gpio/gpio3/value
root@mikrotik:~# echo 1 > /sys/class/gpio/gpio3/value
root@mikrotik:~# cat /sys/class/gpio/gpio3/value
root@mikrotik:~# echo 0 > /sys/class/gpio/gpio3/value

It seems to be low active so I first changed it to 1 which only led to to the pins being on 24 V :frowning:
Changing it back to 0 leads to 9 Volt.

Am I missing something here or do I have to disable this somehow differently. The mikrotik documentation tells me its passive poe.

Can I somehow disable this?
Any suggestions?

Thanks guys