Hi, I've got some interesting news. I tried thegamut file, and it still shows the start screen, and even creates the directory structure before stopping.
Then I tried lapy file, and almost incredibly it boots OK, it si possible to access it via ADB, but the lcd remains black. I have tried to use it blindly, and it boots and shuts down nicely, the wifi starts and stops, it is even possible to connect to the smartphone app, that crashes when is about to show the image. I tried to connect to PC as a webcam, and even more incredibly it works, even if the image is upside down.
Now I'm leaving again, but think that by comparing script.bin from the two last files maybe I will succeed, thank you all for your invaluable help. This time I will have internet access, I will try also to take with me the software thegamut has shared.
Francesco