Don't use update option for kernel because if you encounter any problem during update process, you will not be able to have a chance to use former kernel. Therefore, to avoid such a problem, use install option. In this case , you can enable or disable one of the kernel installations using the grub.conf file.
1. rpm -ivh kernel-firmware-2.6.32-431.3.1.el6.noarch.rpm
2. rpm -ivh kernel-2.6.32-431.3.1.el6.x86_64.rpm
3. chech /etc/grub.conf
vi /etc/grub.conf
default=0 means first kernel from list is active
default=1 means second kernel from list is active
4. After you make the latest kernel active , you can reboot the system
5. init 6
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