Hi, I've been trying to enable Uknown Sources on my Philips 40PFH6550 Android TV as I want to install some apk's on it. Here's what I tried so far:

1. I installed Terminal Emulator for Android on the TV and typed: am start --user 0 -n com.android.settings/.SecuritySettings. This unlocked the previously hidden Security Settings menu for me but the Unknown Sources setting was greyed out so no way to enable it.

2. I installed Developer Tools app on the TV to enable the USB debugging and then try to install apps via the ADB but I see no option for turning on the USB debugging in the Developer settings.

I'm probably missing something? Please give me some ideas what to try next. Thanks!