uname -a
Linux armadillo 4.9.133-at28 #2 SMP PREEMPT Thu Jan 26 17:35:01 JST 2023 armv7l GNU/Linux

cat /etc/debian_version
10.13

dpkg -l|grep bluez
ii  bluez                             5.50-1.2atmark1                     armhf        Bluetooth tools and daemons