Got QMI working !!!
with this command (after the down if wwan0 was up)
sudo ifconfig wwan0 down
sudo echo ‘Y’ | sudo tee /sys/class/net/wwan0/qmi/raw_ip
thanks to the good mkrzysztofowicz from this topic .
then quectel-cm works !
I’d add that command to the next version of the cm guys !