: Look for markings such as R329Q V3.1 or X9x_V1.0 .
Newer firmware builds often include updated codecs to support smoother 4K video streaming and H.265 decoding. Installation Methods firmware tv box mx9 4k android 7.1.2
Always back up your existing firmware if the device still boots. Use the dd command via ADB or a terminal emulator: : Look for markings such as R329Q V3