How do you recover one-time password to ISR G2 2911 Hell

We have got a problem, We did not change the one-time password in ISR 2911 and we can't access the CLI or the ROMMON mode, so we would very grateful if anyone can help me

2900 series router you should wait till it finishes decompression of the image file then press the break sequence.Press Break on the terminal keyboard within 60 seconds of power up in order to put the router into ROMMON. If the break sequence does not work, you can try the Standard Break Key sequence combinations. Please click here for more details.

If you can't use the Break Sequence, pop out the out the compact flash and boot the router. The CF, on the lower left hand corner of the back of the router can be ejected.

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