Upgrade OEL 6.4 with kernel 2.6 to UEK kernel 3.8.13 OEL 6.5

Upgrade from OEL 6.4 kernel version  2.6.39-400.109.6.el6uek.x86_64  
          to OEL 6.5 kernel version  3.8.13-35.1.2.el6uek.x86_64

Stop and disable CRS stack 
# crsctl  stop crs 
# crsctl disable crs

Get and prepare  new YUM repository 
# cd /etc/yum.repos.d
# rm public-yum-ol6.repo
#  wget http://public-yum.oracle.com/public-yum-ol6.repo

# vi public-yum-ol6.repo
-->  find section [ol6_UEKR3_latest] and set Enabled=1
name=Latest Unbreakable Enterprise Kernel for Oracle Linux $releasever ($basearch)
enabled=1    <-- Change this from 0 to 1  

Invoke yum to install new kernel and packages 
# yum update
Dependencies Resolved

 Package                                     Arch          Version                                    Repository               Size
 firefox                                     x86_64        24.6.0-1.0.1.el6_5                         ol6_latest               47 M
     replacing  firefox.x86_64 17.0.8-1.0.1.el6_4
 kernel                                      x86_64        2.6.32-431.20.3.el6                        ol6_latest               28 M
 kernel-devel                                x86_64        2.6.32-431.20.3.el6                        ol6_latest              8.8 M
 kernel-uek                                  x86_64        3.8.13-35.1.2.el6uek                       ol6_UEKR3_latest         41 M
 kernel-uek-devel                            x86_64        3.8.13-35.1.2.el6uek                       ol6_UEKR3_latest        9.0 M
 kernel-uek-firmware                         noarch        3.8.13-35.1.2.el6uek                       ol6_UEKR3_latest        1.8 M
Transaction Summary
Install      20 Package(s)
Upgrade     457 Package(s)

Total download size: 662 M
Is this ok [y/N]: 

yum-plugin-security.noarch 0:1.1.30-17.0.1.el6_5                  yum-rhn-plugin.noarch 0:0.9.1-49.0.1.el6                        
yum-utils.noarch 0:1.1.30-17.0.1.el6_5                           

  firefox.x86_64 0:17.0.8-1.0.1.el6_4                                                                                               


Now reboot the system - recompile VirtualBox guest Additions and restart CRS

# reboot

Rebuild Virtualbox Guest Additions 
# /etc/init.d/vboxadd setup
# reboot 

--> Relink Oracle CRS and RDBMs binaries [ using the relink command ] 

Re-enable and restart CRS
# crsctl enable crs
# crsctl start crs