This thread has info on rooting it (start on page 1) and the page I linked actually has people successfully installing Ubuntu on it. Works pretty well. I flashed android back because I ultimately just read on it and don’t use it as a tablet but if you want to use it as a tablet I think Linux works better. Yu can degoogle it without flashing Linux of course but that’s a whole thing and I don’t know if there’s a custom rom for such a niche device, you may have to figure that much out yourself and disable services etc. the stock boox rom is already fairly degoogled tho thankfully aside from the play store
Oh if you want to de google it then that’s possible too
https://www.mobileread.com/forums/showthread.php?s=042c62c12ab4c37892a412e7afd5bd14&t=355147&page=5
This thread has info on rooting it (start on page 1) and the page I linked actually has people successfully installing Ubuntu on it. Works pretty well. I flashed android back because I ultimately just read on it and don’t use it as a tablet but if you want to use it as a tablet I think Linux works better. Yu can degoogle it without flashing Linux of course but that’s a whole thing and I don’t know if there’s a custom rom for such a niche device, you may have to figure that much out yourself and disable services etc. the stock boox rom is already fairly degoogled tho thankfully aside from the play store