help on how to upgrade cisco 1801 ios v12.4 to 15.1

[malai.joseph]

hello

Kindly help on how to upgrde cisco 1801 ios version  12.4 to 15.1 step by step

thx

joseph

[mfurnival · Accepted solution]

Hi,

IOS install procedure is covered here:

http://www.cisco.com/c/en/us/support/docs/routers/3800-series-integrated-services-routers/49044-sw-upgrade-proc-ram.html

Some things to watch out for:

- make sure you have enough space on your flash for both old and new IOS then you can roll back if need be

- 15 IOS functionality is controlled by licensing whereas 12.4 is not so be aware that you may have to pay for certain features.

[malai.joseph]

Hello mfurnival,

Thanks for quick respond

How to take backup of  IOS image from v15.1 cisco and overwrite to 12.4 v

Joseph