I have PixHawk 6x flight controller. I connected the vehicle to my PC using USB. Under the firmware tab, I see the following message displayed. I assume I select PX4 Pro v1.16.0 - Stable Release option. Could you please confirm?
You can use 1.16.0-stable release, yes. But also note that some additional fixes have been added; if you click on “Advanced settings” → “Beta testing” to select 1.16.1-rc2