Updating your FirefoxOS Device Keon (http://retardevs.tumblr.com/post/44041269759/atualizando-seu-keon)

gistfile1.sh

# download the last release of FirefoxOS here: http://www.rodrigopadula.com/arquivos/Keon-%20FirefoxOS%201.0.1.0-prerelease.tar.gz

Now, the commands

# Install the ADB and fastboot 
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install android-tools-adb android-tools-fastboot

sudo adb reboot recovery # reboot your device in recovery mode
sudo fastboot flash boot kboot.img # install the boot manager
sudo fastboot flash splash ksplash.img # update the boot image
sudo fastboot flash system ksystem.bin # install the new system on device
sudo fastboot flash userdata kuserdata.img # install some user data configuration
sudo fastboot reboot # reboot your keon