4k Frame Rate - Processer/Projector not recognising

[Xar18]

Hi all - trying to play back some 4k rips and having issues with the HiMedia as follows:

- In the main menu, cannot get my lumagen / epson projector to recognise 2160p 24/25/30hz, only 50/60hz (i.e. the screen stays black then bumps back to the previous resolution)
- From the main kodi menu, I can get sound on all the 4k rips without issue, but no video
- From the kodi menu, if I navigate to files > videos> etc then I can get some of the videos to play but not others

For reference, I managed to get my Panasonic 4k blu ray player to stream the video on all of them (albeit no HD audio passthrough)

Funding this very frustrating as I specifically purchased the Q5 for 4k playback. Any advice appreciated