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Bamboo 5.13Bamboo 5.7.x
Bamboo 5.6.x
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If any of your project or plan keys have a "-" in them, try the workaround detailed at http://jira.atlassian.com/browse/BAM-600. Affects upgrades from 0.7.1 or below to 0.8 or higher.
Please follow the Bamboo Upgrade Guide.
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.