Please see Cisco's page at http://www.cisco.com/en/US/products/hw/routers/ps5199/products_password_recovery09186a0080093e12.shtml
for step by step details and more in depth instruction.
1. Reboot
2. Press the "break" button on your keyboard within 60 seconds of the power-up to put the router into ROMMON mode.
3. confreg 0x2142
4. reset
5. type, "no" when prompted to enter the initial configuration dialog.
6. enable
7. copy startup-config running-config
8. conf t
9. enable secret <password>
11. config-register 0x2102
12. reboot again
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