You can install Calibre Companion and a launcher (I use Zeam Launcher) without root using ADB. After installing a launcher and a file manager you don't need to use ADB to install other APKs.
Some of CC settings don't have a touch option to back out so you would need a back button but once it's set up CC doesn't need a back button. I rooted my GL3 (it's easy) and remapped one of the hardware buttons to be a back button. In the past I have used Button Savior Non Root and it worked to add a touch screen back button.
You can set CC to open your books on any installed reader including the Nook reader.
Last edited by Ryzir; 12-04-2019 at 02:01 PM.
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