Updating fedora EOL to latest

WARNING: Do it at your own risk!

1. Edit fedora.repo to include http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/ repository.
2. Yum update.
3. Download and install the latest kernel, kernel-header,kernel-dev from rpmbone for your fedora version.
4. rpm --import the_key__version_you_intend_to_upgrade_to
5.  yum update
6. yum clean all
7. yum --releasever=version_you_intend_to_upgrade_to distro-sync

Fedora 16 -> Fedora 17

1. There are a few problems with the packages: dhclient, dhcp, etc that are not updated resulting no internet connection

Solution

1. Use live cd
2. mount chroot /mnt/sysimage /bin/bash
3. yum check all
4. manually remove and reinstall the packages that reports the error
5. yum update

Fedora 16 -> Fedora 20

 So far no problem. Data still intact except some software removed.