Cisco router password recovery

step 1: press Ctrl+Break once the router boot up

step 2:
rommon 1>confreg 0x2142
rommon 2>reset

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remark:
0x2000 is boot default ROM software
0x0040 is ignore NVRAM
the last 2 is to specifies default boot file name

Router default register is 0x2102, you can check it by "sh version"