Hi,
I lost the function to "arm/disarm" the alarm system with the update to r474 (no arming and no armed state).
I update package
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
After this it seems to work again but i update firmware (by rpi-update) in 3.18.5. I want a full up-to-date raspberry but it seems to be broken again ...
So i downgrade the firmware 3.18.4
sudo rpi-update a171d730a2aa2a83601b778ba5028f026a25ff37
And now it work fine !!
If it can be useful for someone ...
Bye