This should help...
1. Power Down router
2. Jump jumper S16 at the front of the Unit, behind the LEDs
3. Power up the router, it will go to a diag prompt
4. Type following: rb c00000 20; this displays the passwd
wb c00000 0 20;this clears the pasword - sets it to 0
5. Power down the router
6. Remove jumper
7. Power up the router.