How to downgrade kernel in F17?

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http://forums.fedoraforum.org – I am wondering how I go back to an earlier kernel in Fedora 17. I've searched and there's no info out there. One thread discusses it, but descends into questioning why you would want to do it. The reason I need to go back is because 3.5 breaks the VirtualBox additions, so I want to go to the last 3.4 working kernel. I have tried downgrade: Quote: yum downgrade kernel Loaded plugins: langpacks, presto, refresh-packagekit Package kernel-3.3.4-5.fc17.i686 is allowed multiple installs, skipping Nothing to do When I try to install 3.4.6 I g (HowTos)