Is it possible to rebuild a corrupt cookie on a cisco 1841 router?

Hi,
I'm hoping someone can help me rebuild a corrupt cookie on a Cisco 1841 router.
I swapped over CF cards to reformat one and seem to have toasted my router.
Booting normally the router hangs:
System Bootstrap, Version 12.3(8r)T6, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2004 by cisco Systems, Inc.
PLD version 0x0f
GIO FPGA version 0x128
c1841 processor with 262144 Kbytes of main memory
Main memory is configured to 64 bit mode with parity disabled


Readonly ROMMON initialized
program load complete, entry point: 0x8000f000, size: 0xc100

Initializing ATA monitor library.......
program load complete, entry point: 0x8000f000, size: 0xc100

Initializing ATA monitor library.......

program load complete, entry point: 0x8000f000, size: 0x1630e0c
Self decompressing the image : #################################################
############################################################### [OK]

Smart Init is enabled
smart init is sizing iomem
  ID            MEMORY_REQ         TYPE
                0X003AA110 public buffer pools
                0X00211000 public particle pools
                0X00020000 Crypto module pools
                0X000021B8 Onboard USB

If any of the above Memory Requirements are
"UNKNOWN", you may be using an unsupported
configuration or there is a software problem and
system operation may be compromised.

Allocating additional 20092929 bytes to IO Memory.
PMem allocated: 239075328 bytes; IOMem allocated: 29360128 bytes

              Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

           cisco Systems, Inc.
           170 West Tasman Drive
           San Jose, California 95134-1706



Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(13b),
RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Tue 24-Apr-07 14:06 by prod_rel_team
Image text-base: 0x60079270, data-base: 0x61C04A30


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.
------- Router always hangs at this point-------

If I force a boot from rommon I get "Corrupt or missing MAC address cookie" messages.
I can get into rommon priv mode to change the cookie but I don't have a known good example of a cookie from an 1841 to compare my corrupt cookie with, it also seems longer than any examples I've googled. See below:

monitor: command "boot" aborted due to user interrupt
rommon 1 > cookie

cookie:
04 ff 09 86 ff ff ff ff ff ff ff ff ff ff ff ff
4f 43 30 38 34 34 30 53 30 53 40 04 1b 41 04 01
82 49 1f ff 04 42 44 30 c0 46 03 20 00 5b 8a 01
88 00 00 00 00 02 04 c6 8a 49 50 4d 37 46 30 30
43 52 41 03 00 81 00 00 00 00 04 00 cb 89 43 49
53 43 4f 31 38 34 31 89 56 4e 2f 41 d9 02 c1 40
09 86 c2 8b 46 48 4b 30 38 34 36 31 34 58 4b 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 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 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 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 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 ff ff ff ff ff ff ff ff ff ff ff
rommon 2 > priv
Password:
You now have access to the full set of monitor commands.
Warning: some commands will allow you to destroy your
configuration and/or system images and could render
the machine unbootable.
rommon 3 > ?

If someone can help me with a good example of an 1841 cookie and any other pointers that would be much appreciated or if you have any other ideas to get the router going again, let me know. Thanks G.
FreemaGAsked:
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amprantiCommented:
If you have a contract for this device you can replace it ....
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FreemaGAuthor Commented:
Thanks, but unfortunately there's no contract.
0
ludo_friendCommented:
hi - the cookie stores amongst over things the serial, so I doubt very much you'll get anyone to post thiers as it is very unique to the router.

0
FreemaGAuthor Commented:
Well the answer to my question is Yes, it is possible.
I took the information I had from previous logs and managed to recreate the cookie.
The router is up and running again.
Thanks.
0

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