Assuming you have root, you should be able to pull each partition in an adb shell. Sorry I don't recall the commands. I would likely have to dig up some VERY old notes (that maybe gone), or do some serious searching here on other threads.I installed lineageos on my ONN box, but didn't like the results. I was having playback issues in 60 fps video formats. I flashed the factory image back and installed magisk. I have everything set up the way I like but. I spent so many hrs tinkering with it.
Is there a way to backup my ONN image? I'm used to using twrp. I checked the recovery options, but don't see an option to create a backup image. If this is possible, I plan to pick up a few more ONN boxes and just flashing my backup image onto the other boxes.