Access to mode level

[qus83]

Hi all

I have a question regarding to cisco router C800 series 

we have an old router and have old configuration and now we want to use this router again 

I have tried to access to mode level Router> but I couldn't and I keep receiving this messages

Sep 13 13:28:35.237: %CRYPTO-4-PKT_REPLAY_ERR: decrypt: replay check failed
        connection id=2, sequence number=230

Sep 13 13:31:07.899: %CRYPTO-4-PKT_REPLAY_ERR: decrypt: replay check failed
        connection id=4, sequence number=275

Sep 13 13:32:16.809: %CRYPTO-4-PKT_REPLAY_ERR: decrypt: replay check failed
        connection id=4, sequence number=295

Sep 13 13:33:29.830: %CRYPTO-4-PKT_REPLAY_ERR: decrypt: replay check failed
        connection id=2, sequence number=321

so what I have to do to access to mode level and remove the old configuration ?

can anyone help me with that ?

Thanks in Advance 

[evlaa1990 · Accepted solution]

The link below explains how to reset the configuration or get into the router not knowing the old password. 

https://www.cisco.com/c/en/us/support/docs/routers/800-series-routers/12065-pswdrec-827.html

[Roza12]

Thanks for your reply

The problem is I can't access to user EXEC mode and  the privilege mode it's not appear in the screen of putty

So I can't do anything

[Seb Rupik]

The steps above relate to ROMMON, which is accessed immediately after power-on. There is not notion of EXEC. Just enter the commands as they appear in the referenced document.

cheers,

Seb.

[Roza12]

Thanks a lot guys. The problem is solved

I have followed the steps and it was so helpful thanks again