It was easier upgrading from disc than unstable network :D

  • Download DVD ISO Centos 5.4 from centos.org
  • Upgrade from DVD
# mount /dev/dvd /media/cdrom
# yum upgrade --disablerepo=\* --enablerepo=c5-media

Be patient and wait until it finished

# reboot

Now you’ve got a nice fresh centos 5.4

# cat /etc/redhat-release
CentOS release 5.4 (Final)

done

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