Using it in my current fire tv lite since bought it in 2023. Feel free to try it out
Install apk and then grant below permissions from adb
- To be able to listen to key presses on remote
- To be able to show the volume controls UI
adb shell settings put secure enabled_accessibility_services com.example.volumecontrolservice/com.example.volumecontrolservice.AccessibilityService
adb shell appops set com.example.volumecontrolservice SYSTEM_ALERT_WINDOW allow