How can I edit file in /etc folder on UT 20.04 (Focal)?

[pleca]

Hello community,

I refer to this thread:
https://forums.ubports.com/topic/9317/how-can-i-change-scaling-on-20-04-focal-without-ut-tweak-tool-and-without-reboot?_=1698522355620

I'm running Pixel 3a XL. I would like to change scaling in /etc/deviceinfo/devices/halium.yaml ("GridUnit"), unfortunately file is unwritable.

As there is no UT Tweak Tool available, so I enabled Developer mode and I tride to follow this: https://ubports.com/en/blog/ubports-news-1/post/terminal-chapter-3-3073 to make fs r/w.

I tried both ways:

    $ adb shell

    $ sudo touch /userdata/.writable_image

    $ sudo reboot 

and

    $ adb shell

    $ sudo mount -o remount,rw / 

None of above worked, file is still unwritable.

Therefore my question: How can I make fs r/w to edit halium.yaml in /etc?

[lduboeuf]

@pleca
You can install Tweak tool, this build works for focal even if named xenial... iirc

https://gitlab.com/myii/ut-tweak-tool/-/merge_requests/109

[aimar]

Does not sudo nano /etc/deviceinfo/devices/halium.yaml work?
Or using chmod does not help?