OlpcWiki:Talk:Olpc-update#Progress_report
during the update, anything in /home/olpc should of been left alone. However, any programs installed by ‘root’ in system folders will be ‘removed’ (essentially a ‘clean’ environment is created for the update). The suggestion method in the new environment, is re-installing all of those applications with the latest versions, to assure best compatibility with the newer OS.

Other than that, there are two options for you.

• Hold down the (0) on the game pad, when you boot up. This will give your older environment back. (including the older OS).
• Do a ‘diff’ between / and /versions/run/656, any difference you will need to determine one at a time, if you can apply to your current environment. You will then be able (as root) ‘mv’ or ‘cp’ them over. (not a task I enjoy, I assure you!)