Cisco IOS upgrades

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I am going to update the IOS on my 857w router. The documentation i have found is for the 800 series routers but with no specific mention of the 857 range.

The document is here.

Are those instructions correct for the router I have, thanks!
 
Well everything worked up to the point where i tried to copy the new IOS to the router.

I got the following error:

Error opening tftp://10.10.10.11/c850-advsecurityk9-mz.124-11.T.bin (Permission denied)
 
Yes it did. Its in the root of the tftp server folder on my laptop as we speak.

I can ping the laptop from the router too.
 
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