Cisco WS-C4900M can't reset password when booting from tftp

[Michael Peel]

I have a WS-C4900M that was purchased second hand and the image that is on it appears to be corrupt. I have tried to confreg the system to ignore the startup-config. The system will show in the startup that it is set to 0x2142, but when I  reset it (like it tells me to do after the confreg) and then go back into ROMMON the confreg resets back to 0x2102. Even if I don't do the reset and try to boot to the image via tftp I still get prompted for login information that is unknown. Since it was second and the person that sold it doesn't know that info either. Does anyone know how I can get this thing to boot via tftp and to ignore the startup-config? I would really like to get this unit working so any help would be great.

Thanks,

Michael

[Leo Laohoo · Accepted solution]

The system will show in the startup that it is set to 0x2142, but when I  reset it (like it tells me to do after the confreg) and then go back into ROMMON the confreg resets back to 0x2102.

So after config-register value is set to 0x2142, then boot appliance in default.  Did you clear the config with the command "wr erase"?

[Michael Peel]

Even though ROMMON says 0x2142 before the required reset after running confreg if I boot to a network image I am still prompted for a username and password, which I do not know. So I can not even get to the point were I can do a write erase.

[Michael Peel]

It looks like none of the information that I am adding to the ROMMON boot config via set commands such as IP information is being saved. This unit unlike other cisco units that I have worked with doesn't have a synch command to set the set ROMMON boot config.