Aucun accés sur le routeur (ligne etc rien )

OK,
voilou:
https://www.cisco.com/c/en/us/support/docs/routers/3800-series-integrated-services-routers/112058-c1900-pwd-rec-00.html
tu as un câble console et un port série, pour le break ?

ok thanks, je vais essayer pour voir,

oui j'ai un cable console et un port serie,

la procedure ne passera pas voici le message d'erreur sur putty.

-----------------------------------------------------------------------
Cisco Configuration Professional (Cisco CP) is installed on this device.
This feature requires the one-time use of the username "cisco" with the
password "cisco". These default credentials have a privilege level of 15.

YOU MUST USE CISCO CP or the CISCO IOS CLI TO CHANGE THESE PUBLICLY-KNOWN
CREDENTIALS

Here are the Cisco IOS commands.

username <myuser> privilege 15 secret 0 <mypassword>
no username cisco

Replace <myuser> and <mypassword> with the username and password you want
to use.

IF YOU DO NOT CHANGE THE PUBLICLY-KNOWN CREDENTIALS, YOU WILL NOT BE ABLE
TO LOG INTO THE DEVICE AGAIN AFTER YOU HAVE LOGGED OFF.

For more information about Cisco CP please follow the instructions in the
QUICK START GUIDE for your router or go to https://www.cisco.com/c/en/us/products/cloud-systems-management/configuration-professional-catalyst/index.html
-----------------------------------------------------------------------


User Access Verification

Username: cisco
Password:
% Login invalid

Username: cisco
Password:
% Login invalid

Username:
% Username: timeout expired!

il faut envoyer le break au bon moment ...
pour passer en rommon
Si tu n'arrives à envoyer le break, tu retires la compact flash qui doit se trouver dans le slot CF1 à l'arrière, et démaarer il partira en Rommon, alors, tu pourras modifier le config-register