Pine HDMI -> DVI monitor

[Pineapple]

Got my Pine RockPro working and now actually wanted to use it in my garage with an old Monitor.

Today reveiceed the HDMI to DVI adapter and hapily connected everything together and no signal.....   Plugged the HDMI cable in my laptop and the old Monitor comes a live. So the adapter is working but somehow not with the Pine board.

Did some research and I came across some old posts that this problem is known. Only thing as a solution found so far is what I found on the armbian site.

https://www.armbian.com/pine64/

They say:  If you use a DVI display don’t forget to define 

Code:

disp_dvi_compat=1

 in 

Code:

/boot/armbianEnv.txt

 (supported starting with 5.21).



Now I tried to put in the line and save but with no succes. Seems I have no permission?