On Fri, Apr 2, 2010 at 2:46 PM, mattias <mj at mjw.se> wrote: > i maybe asked the question litle wrong > i meen > i have centos 5.0 now > but can i downgrade to e.g let's say 2.0? No, won't work. You can, as someone suggested, back up your files and re-install but there's very little chance application data and files will be compatible.