Updating RPi Firmware
From SingletonMillerWiki
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Install Hexxeh utility
This will save you time and effort in the long run.
Install GIT in order to be able to access the Firmware repository on GIT.
sudo apt-get install git-core
Install Hex's utility
sudo wget http://goo.gl/1BOfJ -O /usr/bin/rpi-update sudo chmod +x /usr/bin/rpi-update
Run Hex's firmwre utility
sudo rpi-update