Extracting .dtb file from a running Android OS

Help & Support Operating System
6

Wow, I never knew even an Android TV Box does come with unrooted (customized). Anyway, assuming for the worst case where the TV Box is not rooted, is there a better way to do this thing on a non-rooted Android TV Box?

After upgrading to Coreelec 19.2-Matrix_RC2 p281 1G RAM is not booting