http://wiki.laptop.org/go/OLPC_Firmware_q3a12 This is a stabilization release for B2 machines, fixing numerous issues with the q3a11 firmware that was installed on them during manufacturing. It works on XO-1.5 A1, A2, B1, and B2 systems, but does not work on any XO-1 machines. The change list is rather long - see the release page above for details.