A stable version of Linux Kernel 3.9 is now out, and can be installed by the following steps on you ARM powered device, try this at your own risk.

You can find the release announcement here. In this tutorial, we will see how to install Linux kernel 3.9 in Ubuntu for ARM or any Debian based ARM system.

Enter the following command in terminal:

cd /tmp
wget http://dl.dropbox.com/u/47950494/upubuntu.com/arm-kernel-3.9 -O arm-kernel-3.9
chmod +x arm-kernel-3.9
sudo sh arm-kernel-3.9
sudo update-grub
sudo reboot

To remove the Kernel or downgrade the Kernel enter the command below:

sudo apt-get purge linux-image-3.9*