Somebody else has pointed out that the raspi3-firmware package is overwriting user configs - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848101 . They didn't fix the problem.
Somebody else has pointed out that the raspi3-firmware package is overwriting user configs - https:/ /bugs.debian. org/cgi- bin/bugreport. cgi?bug= 848101 . They didn't fix the problem.