I purchased a Google certified Android TV box made by my ISP. It runs on Android 9.0. It comes with a very ugly default custom launcher and it seems they've blocked third party launchers on it. When I try sideloading any APK for a different launcher it simply says "App not installed". I can't install them from the Play Store either. I've tried Leanback Launcher, ATV launcher, TVLauncher, HALauncher and a few more. Could someone help me out with this?
Thank you.
Have you tried using Hijack with Hal Launcher?