Series 800 factory default restore

Hi,
I'm having trouble with an 800 series router. Work has borrowed it to me so i can practice for my icnd2 exam. Only problem is it has a username and password on it. I have been told i can wipe the device and start over. but i cant get in to the user mode or any mode's as i don't have the user name and password.
Is there a way of resetting the router back to factory defaults with out logging in to it?
Thanks Paul

please review this document.
http://www.cisco.com/en/US/products/hw/routers/ps380/products_password_recovery09186a00800942bc.shtml
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