OLPC Update
From HacDC Wiki
Clean Install
This will COMPLETELY WIPE the data from the XO... YOU HAVE BEEN WARNED
- download the latest XO OS build (os###.img and os###.img.fs.zip) to a thumbdrive
- rename os###.img.fs.zip to fs.zip
- insert the thumbdrive in the XO and power off the unit
- while pressing all four game buttons (the cluster of four buttons above the power button) power on the machine
- follow the directions on the screen