Upgraded from Fedora 12 beta , now have Fedora 13?

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http://forums.fedoraforum.org – Greetings all, I installed Fedora 12 beta (version relased 5 days before official release) on my MacBookPro. Then I did a software update and noticed that now I have Fedora 13 not Fedora 12 Stable. How can I downgrade to Fedora 12 stable ? I dont like working with testing verion ? Thanks in advance. (HowTos)