To install PX4 firmware (for moment only the quad is available).

Connect your Raspberry Pi to internet, open one terminal and execute the following commands:

curl packages.erlerobotics.com/keys/deploy | sudo bash
sudo apt-get install px4-erle-robotics

Open a terminal and type the following:

sudo apt-get purge -y px4-erle-robotics

Note: Before install PX4 package please uninstall other apm package. Please, be careful with PX4, for the moment is beta.