Fedora 16 'yum update' not working

I have recently installed Fedora 16 on my desktop. After the intallastion was over I tried to update my repos by issuing sudo yum update command. I got the following output: Loaded plugins: langpacks, presto, refresh-packagekit Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again I Searched on the Internet for the similar problem. There were quite a few solutions available and I tried all. I tried the following things:

1. Edit fedora.repo and fedora-update.repo in which I removed s from https.


2. I tried updating certificate using yum update ca-certificates and yum reinstall ca-certificates


3. I tried yum clean all and rpm --rebuilddb.


4. I also commented mirrorlist line and uncommented baseurl line in fedora.repo and fedora-update.repo files.

None of the above solutions are working for me. Can anyone suggest where the problem lies?

Following are the links where I took reference from:

1. yum Damaged repomd.xml file


2. http://ift.tt/1BsWn6y


3. http://ift.tt/1yiIk5V