thanks again for your many comments, suggestions and ideas. To answer some questions from some of the replies, I'm on 18 inch wheels, haven't tried it in manual mode.
On Friday I will be trying to go up again the steep slope and I will film the slope and also show my x5 trying to go up in forward and in reverse.
Btw, I called the dealer and they think it might be a problem with the awd system.
I will update this thread on Friday. Thanks again.