No. I don't have any other voxl.
Yes, it's properly installed. I had previously worked with the same ADB installation. Suddenly, it stopped responding. I also tried with two other machines with proper ADB installations. It showed the same problem (no device found).

@tom It's still same!!

@tom said in Unable to connect to host PC using adb shell & SSH:

fastboot devices

hey @tom this is the output.

Hello @tom This happened when I ran the platform release install script.

@tom @Alex-Gardner

I tried to flash your latest platform release (0.9). But I have faced the same issue. No ADB shell connection. Please take a look.

@tom I have a little confusion here. As I said earlier, the ADB shell has not been working. So how can I install your specified system image using the ADB pull command?
like these commands:
adb pull /data/modalai/opencv_tracking_intrinsics.yml
adb pull /data/modalai/opencv_stereo_intrinsics.yml
adb pull /data/modalai/opencv_stereo_rear_intrinsics.yml
adb pull /data/modalai/opencv_stereo_extrinsics.yml
adb pull /data/modalai/opencv_stereo_rear_extrinsics.yml

hello @Chad-Sweet Please take a look
Using lsusb command:

@tom said in Unable to connect to host PC using adb shell & SSH:

lsusb

Yes, for the ADB shell, I have connected the drone using a USB. Then I setup wifi network. After that, I was using SSH.

I am using a Modal AI RB5 flight drone.
At the beginning, I was able to connect the drone with host pc after installing ADB shell. Then I was able to use it via SSH. I have almost worked it out in two months. I installed a new image of RB5 Platform 1.3.1-0.8 (RB5 Flight with VOXL SDK Platform Releases) a few weeks ago. It was working fine and had no issues with adb shell and ssh. All of them were working fine. 
However, it abruptly stopped connecting using both adb shell and ssh.I tried several times in various ways, but it was not connected via adb shell, or ssh. I checked the drone, it's working and switched on. 
After that, I also checked with Qgroundcontrol software. It has not detected the drone. I have attached the image. Can you please help me with that problem?