For your first problem: don't use the third line, kill it and go on with the 2 first lines in the austostart.sh.
I use kodi with the resolution of 1920 * 1080, only for UHD the switching to 3840 * 2160.
For your first problem: don't use the third line, kill it and go on with the 2 first lines in the austostart.sh.
I use kodi with the resolution of 1920 * 1080, only for UHD the switching to 3840 * 2160.