Px4flow sensor issue

Dear people.

I have the following setup:

-PixHawk 4 mini
Jetson TX2

First I have set the version master to the pixhawk 4 mini

The communication from the companion board (Jetson TX2) to the groundcontrol station is via wireless.

I use EKF2 and I had Set

 SENS_FLOW_ROT to 270 degrees, default 
 EKF2_AID_MASK to use optical flow and GPS
 EKF2_HGT_MODE to use the range finder

So far I could see in the mavlink inspector the:


Then after some few tests with the drone where I have disabled the px4flow. Then, I upgraded the pixhawk 4 mini with the version 1.9 stable over qgroundcontrol station.

Then, the flow sensor stop working I do not see any more the -optical_flow_rad in the mavlink inspector. I can see the leds blinking on the px4flow sensor.

The extras.txt in the /etc file of the SDcard of the pixhawk is:

mavlink stop-all
mavlink start -d /dev/ttyS1 -b 921600 -r 1000 -m onboard
mavlink stream -d /dev/ttyS1 -s ATTITUDE -r 1000

I have read in the link  


`This does not work on FMUv5 (Pixhawk 4) for PX4 versions less than 1.9.0. All other PX4/Firmware versions should work.` 

This means that the version 1.9.0 stable does not support PX4FLOW???

Any help or advise I really appreciate it.