My kid pulled my CP out now getting Illegal MAC address error

So my kid was playing around and pulled the CF out of my 2801 router. It is a router I use at home for testing purposes. Well now I am getting an error Illegal MAC when I try to use rommon to tftpdnld a new IOS. I have also tried xmodem without success. I did read about bad cookies but there wasnt really an answer to the problems presented. Can someone point me in the right place.
Thanks

So through trail and error I was able to manipulate the cookie to finally work on my machine. This address helped tremendously.
https://learningnetwork.cisco.com/thread/23693
I did have to make up a MAC address but I used this address http://standards.ieee.org/develop/regauth/oui/oui.txt
to at least get the correct vendor type.
Everything loaded from there. There are so many people who stated it was a compact flash issue. This was not the case at all. It was a corrupt cookie on the mainboard.

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