Bamboo 1.0.5 Upgrade Guide
Upgrading from Bamboo 1.0.4 to 1.0.5
It is strongly recommended that you back up your xml-data directory before proceeding. For full instructions please follow the Bamboo upgrade guide.
Upgrading from Bamboo 1.0.4 and earlier
In addition to the above, please read the Upgrade Guide for every version you are skipping during the upgrade. The complete list of Upgrade Guides is available here