+ 0 Votes did you buy this on Ebay? CG IT 4 years ago what you might have to do is erase the startup config which should prompt setup. you might want to check Cisco's web site for an IOS for your 2520 and download it. I believe that all the old IOS images for the 2500 series are freely available. Only requirement is to register on their site. you can then install the IOS onto the router.