About the stylus. As I know there are different versions of this tablet. I, for exemple, have bought my tablet about 3 years before. It is the TCL version (look at the serial number, the actual model starts with, I think so, TG, mine with TCL).
The TCL version had the CEP02 stylus (from cube). Unfortanately it isn’t available anymore. There are rumors that it works also with the Hipen H2 from Chuwi. I’ve tested it with a Hipen H3 (by modifying the touchini.gt, like in the youtube video you mentionned) and it didn’t work. I think there is another chipset in these two models, as the driver manager of windows says that there is a Goodix1001 chip, while in a chuwi hi13 (which was designed to work with the Hipen H3) is an Goodix1002 chip. Also the pressure sensitivity of the stylus are different. The Hipen H2 and the cube CEP02 are designed with a pressure sensititvity of 256 points, I thin the Hipen H3 has 1024 or 2048.
Would you mind share if it worked for you with the Chuwi Hipen H3. And if yes could you please give me the name of the chipset in the windows driver manager that you have (either Goodix1001 or Goodix1002). Thanks you a lot.
Edit: As I read somewhere else, the Hipen H2 is just an ordinary stylus (no pressure sensitivity). The Hipen H1 should work with the older version (TLC) of this tablett