BBM, Blackberry’s ancient messaging service make its way to Android and iOS devices last October, hoping to attract more users. BBM is battling with WhatsApp, Viber, Skype, iMessage to be the best IM in the world
BBM Apk was downloaded and sideloaded into the phone.
Michael Faro-Tusino from MyNokiaBlog.com uploaded a video showing the Nokia N9 running the Sailfish OS and he also posted a guide on installing Sailfish OS on your N9.
Remember that this is not the official port so you will experience some bugs such as:
Android layer not working
Swipe down to close, actually being swipe right-to-left
Time not setting properly
Camera and GPS does not work
Apps may need to be launched
twice (crashes first time)
Now, the easiest way to install it is to follow the guide for installing Nemo.
and replacing the Nemo.tar.bz2 file mentioned,
with the file from here