Question about used cisco router?

Sure, you'll need to patch in on the consols port and send a break while it boots to go into ROM monitor mode. There's plenty of details on pword recovery on Cisco's website, e.g. a href="http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00801746e6.shtml" rel="nofollow"http://www.cisco.com/en/US/products/sw/i…/a