I've extracted the DTB from latest H96 MAX Android 7.1.2 firmware and tried to use it with the current build for RockPro64. It boots fine and the ethernet works but there is no sound over HDMI.
After playing with the DTB a bit I got the HDMI audio to work so the box is now at least usable for basic streaming over LAN.
What works:
- HDMI (both audio and video)
- GPU and VPU acceleration
- LAN
- USB (both 2.0 and 3.0)
What does NOT work:
- WiFi and BT (possibly QCA9377 using SDIO)
- IR
- deinterlacing