IOS upgrade issue

[Vinayaka Raman]

I am running 12.3(11) T8 on Cisco 2821 platform and trying to upgrade to 15.0. No luck, it gets into diagmon. So I tried to upgrade it to 12.4 24T.

But failed several times on different routers. Is there an intermediate version I should land before jumping to 12.4 24T?? Please advice

[hanyawad]

Hi Viinayaka,

go to this web page you'll find which ios version and feature supported on which platform.

http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp

and also you can try these links

http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a00801fc986.shtml

http://www.cisco.com/en/US/docs/routers/access/1800/1841/software/configuration/guide/b_image.html

rate please if it helpful.

regards,

Labib

[Leo Laohoo]

No luck, it gets into diagmon.

Console into the router and reboot.  Post the entire bootup process.

[Vinayaka Raman]

The issue was with command syntax used ..in 12.3 upgrades to next version boot system flash syntax doesn't work..we need to use boot system flash:image-name syntax..misguiding iOS syntax!

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