CS has produced an updated version of M3 3.0.3 firmware:
- 1080p / 240 dpi Android UI
- Full screen by default, not need correct screen size in Samsung TV
- Test all sound volume and passthrough (HDMI / ARC / SDIF)
The big fixes make it better than official firmware so it is worth an install.
https://www.mediafire.com/folder/p68yp1t8dy226/HiMedia_M3