sudo -i
mount -o loop /tmp/*77*.iso /mnt
cat > /etc/yum.repos.d/cd.repo
[cd]
name=cd
baseurl=file:///mnt/
enabled=1
gpgcheck=0

#[PRESS enter and CTRL-d]
yum clean all; rm -rf rm -rf /var/cache/yum;  yum makecache fast
yum -y update --skip-broken
yum update
yum erase *devel
yum update kernel redhat-release
umount /mnt
rm -i /etc/yum.repos.d/cd.repo /tmp/*iso
cat /etc/redhat-release
reboot