Bought the RealMe Android TV (version 9.0) 108 cm (43 inch). Followed the steps mentioned in the thread to change default Homescreen to HAL Launcher.
https://android.stackexchange.com/questions/162935/completely-change-home-screen-on-android-tv
But after uninstalling the Google tvlauncher and leanback launcher, the home button takes to screen which shows only the wallpaper. Eventhough HAL Launcher installed, it didn't use that.
Also long press of back button didn't show the option to choose launcher.
I also installed Button mapper to change the home button mapping. But after installing Button Mapper, the accessibility menu stopped working. Not able to see the options under accessibility menu.
I had to reset the TV to factory settings. Any help to change the launcher would be greatly appreciated.
Finally am able to change launcher using Buton Mapper.
After installing button mapper, enabled USB Debugging and issued below command.
adb shell pm grant flar2.homebutton android.permission.WRITE_SECURE_SETTINGSThen changed the home button to open HALLauncher.
Thanks a lot Button Mapper Dev Team. They responded immediately. Great support.