IOS upgrade

[xl-Tcs-Voice]

Hello,

I have downloaded this IOS file
c2951-universalk9-mz.SPA.152-4.M7.bin.

Now, please let me know the steps to upgrade the firmware on ISR C2951 router.

Thanks,

[Leo Laohoo]

1.  Copy the IOS into the router; 

2.  Change the boot variable string to instruct the router to boot the IOS; 

3.  Save the config; and

4.  Reboot the router.

[xl-Tcs-Voice]

Thanks