@Benoitm234, glad to hear that it worked finally, and thanks in advance to help spread the word.
By the way, I have recently set up a Wiki page for Rayshobby, in order to host user-contributed content. This is suggested by Andrew from Australia. He wrote down some initial notes about how to set up RPi to work with OSPi. The Wikipage is at this link:
We will gradually refine the Wikipage, and hopefully it will receive more community support from users.