[wrxtasy]

Sorry but this is not a Android DIY Firmware Forum, that is exactly what the Freaktab website Firmware ROM's & Tools sub-forums are for where all the instructions and help should be asked for regarding Firmware. The Subforum to look for is the AMLogic S912 for the Beelink GT1.

For any 1080p Netflix on any Android device you need at least Widevine L1 and HDCP 1.x. And the correct Android Firmware frameworks.
If your box was not sold with that DRM forget about 1080p Netflix, HBO etc. it cannot be added via flashing any Firmware found on a website.
This is why specific MECOOL boxes names keep popping up, because they are now sold with Widevine L1 DRM and HDCP 1.x.