First make sure the machine is NOT installed with the latest build. Then locate the latest build from the following directories:
- Install a few activities from http://wiki.laptop.org/go/Activities, for example, Implode and XaoS.
- Play the activities.
- Update the machine to the latest build, using olpc-update.
- /home/olpc/Activities/ contains non-empty files.
- /home/olpc/.sugar/default/data/ contains non-empty files.
- The activity icons still appear in the task bar, and the activities are still playable.