Since nobody answered or sent out a link the the firmware, I went through hell and back to find the firmware. If Dibbyb's comment in post 4
is correct, then I was able to find the exact firmware.
Here is the link where you can download it. I also include RockChip Batch Tool v1.8 with USB drivers and Driver assistant in the .rar file, which I assume is the tool that is used to flash the projector (at least this is the tool that I use to flash all my Rockchip android devices)
As my projector hasn't arrived yet, I haven't validated this image., just going by the image name that Dibbyb mentioned. So I claim no responsibility if something goes wrong. For anyone who decides to try this image, please let us know if it works and how you flashed the image. It particular I'd like to know how to put this projector in recover mode so that you can flash the image using the RockChip Batch Tool.