I believe, it is possible to get an IOS from a similar router.
 
maybe from a skunker....and use that on yours.....
 
 
> Date: Mon, 9 May 2011 13:52:37 +0300
> From: ajochola@gmail.com
> To: skunkworks@lists.my.co.ke
> Subject: Re: [Skunkworks] cisco router 831
>
> Kilel....thats a tough one without the Valid ISO
>
> On Mon, May 9, 2011 at 1:50 PM, Ronnie kilel <ronniekilel@gmail.com> wrote:
> > Thanks anyway for trying
> >
> > On Mon, May 9, 2011 at 1:47 PM, Steve Muchai <smuchai@gmail.com> wrote:
> >>
> >> On Mon, May 9, 2011 at 12:39 PM, Ronnie kilel <ronniekilel@gmail.com>
> >> wrote:
> >> > No i don't have the valid ISO image that is my challenge
> >> >
> >> Hmm...I guess you need to find a IOS first. Sorry can't help you there.
> >>
> >> BR,
> >> S
> >>
> >>
> >>
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