I was running an SD-image based piaware instance. Just to make a system update & upgrade, I entered sudo apt-get update && upgrade and answered (probably with no sufficient understanding) “yes” to a question regarding the way to upgrade of dump-fa to 3.8.1. Can’t recall the question exactly but the result is now I am not able to control gain via /boot/piaware-config.txt. Instead of that, I have to modify /etc/default/dump1090-fa in order to be able to control gain.
Any ideas how to revert to the situation gain is controlled via /boot/piaware-config.txt?