May I know how frequent does Centos Dev Repo (C5 Testing Repo) update the patches? or Where can I find this information?
There is no official information on the subject, but if you need some newer software versions, you can get them from RPMForge. Automated RPMForge repository installation script is available here: http://wiki.centos.org/VladislavRastrusny/AutoRPMForgeRepo.
If some packages are protected when you try to update them, you can use
switches to temporarily disable all repositories and their protection.