Goodness me. This sounds like a real can of worms.
Also pity the YouTube tutorial is in Chinese. I find it impossible to follow.
After the issues I had with the Oculus runtime, I'm not game to try changing things for now.
If anyone can post an English version of exactly what to do, then I may become game, but trying to interpret what happening in Chinese? No, I don't think so.
However it is encouraging the the Pimax has the capability. Perhaps the Pimax engineers will pull their finger out and release a new version of the firmeare and software to allow non-geeks to get the best out of Pimax.