Hi Maqed,
Basically you need a feature set in that particular IOS which you are running. You must be running IP Base feature set in release 12.0(9) so if you upgrade your router with same release 12.0(9) but with Ip Plus feature set you will get it working.
So while downloading IOS version jus check if that is having Ip Plus feature set.
HTH
Ankur
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