NicoD and Jeanrhum, Thank you for your replies.
h96tvbox.com already contacted but no response so far. Their last update of the firmware list dates back to July. Weird!
Sorry, I'm going to be more direct. Has a member of this forum owner of a H96 Max X3 tv box, already made a backup of the stock ROM?
Please Can you make the link available to me so that I can download the stock ROM backup ?
Thanks for your help