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link:++https://fedoraproject.org/wiki/Releases/Rawhide++[Rawhide] and link:++https://fedoraproject.org/wiki/Releases/Branched++[Branched] are the development releases of Fedora. They are suitable for users developing or testing Fedora before public release. They are *NOT SUITABLE* for regular day-to-day use unless you are a fairly experienced user, and certainly not suitable for mission-critical use. You should read through those pages carefully before deciding to run Branched or Rawhide. See the link:++https://fedoraproject.org/wiki/Fedora_Release_Life_Cycle++[Fedora Life Cycle] for more information on how the whole Fedora cycle works from Rawhide, to Branched, to the milestone releases (Beta), to the 'Final' release.
Upgrading to a Branched release or to Rawhide can be done using xref:dnf-system-upgrade.adoc[DNF System Upgrade].
Can I upgrade from an End Of Life (EOL) release?
Fedora strongly discourages running an end-of-life release on any production system, or any system connected to the public internet. You should never allow a production Fedora deployment to reach end-of-life in the first place.
With that in mind, if you do have an end-of-life release installed on a system you cannot just discard or re-deploy, you can attempt to upgrade it, though this is not officially tested or supported.
If you have Fedora 21 or later, you can try to upgrade using xref:dnf-system-upgrade.adoc[DNF System Upgrade].
If you have Fedora 20 or earlier, you will have to perform at least part of the upgrade with bare `yum`. You can either use that method to upgrade to Fedora 21 or later and then use DNF system upgrade to upgrade from there to a currently-supported release, or just use bare `dnf` or `yum` for the entire upgrade process.
Note that when upgrading from Fedora 20 or earlier, you are both upgrading from an end-of-life release and using a not-officially-recommended upgrade mechanism; such upgrades are very much performed 'at your own risk' and may well require various kinds of manual intervention to run and clean up the upgraded system, if they work at all.
Upgrading using the Fedora installer (anaconda)?
Fedora releases up to Fedora 17 included upgrade functionality in the Fedora installer, anaconda. This can be a better choice than a package manager upgrade for some End Of Life (EOL) upgrades. If you are attempting to upgrade from Fedora 16 or older, it is highly recommended to upgrade to Fedora 16 and perform an installer upgrade from Fedora 16 to Fedora 17 before upgrading any further.
To upgrade using the installer, boot the system from a network install or DVD image for the target release, and run through the initial steps of the install process. After you select storage devices the installer should offer you the option to upgrade the installed system.
If your installation is located on a 'specialized' storage device, be sure to configure and select it.