Please follow the steps below to fix poor colour performance in HDR mode:
1. Switch the projector to HDR mode by supplying the projector with HDR video content
2. Use "Reset current picture mode" for HDMI1 interface under HDR mode
3. Use "Reset current picture mode " for HDMI2 interface under HDR mode
4. Use "Reset current picture mode" for USB interface under HDR mode
The issue should now be fixed after following the above steps.