Recovery Cookie Cisco 2801

[Daniel Vieceli]

Hi, i'm building my CCNA Voice lab, but my cisco 2801
problem is cookie corrupt.

i need password for rebuild try at this  website https://secure.corradoroberto.it/cisco/Online_password_calculator_for_Cisco_rommon_command_priv.py

but dont work.
the password dont macth

rommon 30 > priv
Password:
rommon 31 > priv
Password:
rommon 32 >

Cookie is:

cookie:
04 ff 09 86 ff ff ff ff ff ff ff ff ff ff ff ff
4f 43 31 32 30 31 30 38 51 5a 40 04 1c 41 07 00
82 49 1f fe 07 42 43 30 c0 46 03 20 00 5b 8b 05
88 00 00 00 00 02 04 c6 8a 49 50 4d 37 56 30 30
43 52 41 03 00 81 00 00 00 00 04 00 cb 89 43 49
53 43 4f 32 38 30 31 89 56 30 34 20 d9 02 c1 40
09 86 c2 8b 46 48 4b 31 32 30 32 46 33 4a 48 ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

Thanks!!!

[michael o'nan · Accepted solution]

Does it boot to ROMMON and won't let you boot the IOS?

[Daniel Vieceli]

Hi, router lost mac address in eeprom.

start ios but crash when ethernet ports start

i need write a new mac address in eeprom;

but need password to enter priv command at rommon

[Daniel Vieceli]

Using this tip , worked!

http://zuzububu.wordpress.com/category/cisco/

[lewisrumsey1]

Hi Daniel, I too am having this problem with a 2801.

I have the same first line and cannot seem to calculate the correct password despite many tries, same on my other working 2801 with a valid cookie.

04 ff 09 86 ff ff ff ff ff ff ff ff ff ff ff ff

I was wondering if you remembered the password you used?

Many Thanks,

Lewis

[Daniel Vieceli]

Hi Lewis, i used this to help me and i calculate the password

http://www.chainringcircus.org/hacking-rommon/

In my case is this 

rommon 1 > cookie

cookie:
01 01 00 12 01 fd 68 60 43 20 01 ff 03 6d 00 20
00 00 00 00 00 00 00 00 46 4f 43 08 38 32 43 52
57 03 01 00 00 00 00 00 00 ff ff ff 50 06 49 1e
4a 05 ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

01 01 +

00 12 +

01 fd +

68 60 +

43 20         =  AE90 

And worked i can use the router and now is working fine.