+1. ADB, either directly or indirectly is the only choice to debloat Android devices. This was the case of one of my old tablets (a cheap 10'' Mediacom crap) that resisted every rooting attempt, no matter which tool I could try. Removing unneeded services and stuff became a breeze, although the process is quite dangerous and I ended up with something that can't run Google services anymore, but does run Whatsapp for the 7-8 contacts I couldn't convince to use email, and download from F-Droid, which is enough for me.