Somebody has/had added bluez-utils 3.23 into his own repository (apt-cache policy bluez-utils will tell the source usually). Normally it won't install (overwrite 3.22 which is in the 50-2 release) because it's a system package, but after entering the VERY dangerous red pill mode this update is made possible. After installing any non-nokia provided bluetooth packages the subsystem might be totally broken until you reflash. So beware with red pill mode and upgrades from non-nokia certified repositories.