Sir Can I from cw2000 to find the router serial no or machine no?

Sir I find in 1841 model router,the wan interface have "clockrate 2000000" cmd,and try to remove it by "no clock rate 2000000",but still in it,why? and how to remove it?

Sir when I use isdn to my backup line on router,and finish to setup isdn configuration,and try to connect isdn,I find can't connect isdn,and I find this messege below..BRI0/0 is up, line protocol is up (spoofing) BRI0/0:1 is up, line protocol is dow...

Why will disppear the IOS?and my model is 2611 router..If this status happenes,what fator is this basis reason

Sir I have a CCO Accout,but when I want to download the latest version of cw2000,it can't let me login,why?