Cisco 878 "priv" command password recovery in Rommon mode

Hi,
There was " Cookie information corrupt" error on cisco 878 and I enter cookie information with cookie command. The priv command password is "0000" when all cookies zero, but I inserted wrong cookies . I want to edit cookie information. The priv command password changed and I can't edit cookie informations.
How can I recovery priv command password in rommon ?
Thanks for help,

Hi friends,
I solved problem. You must add the first five numbers in 16-bit hex in cookies :
Sample :
00
01
+
00
30
+
85
d7
+
e0
60
+
0a
ff
= 17167
The password is only four characters, so remove the most significant bit and the password is 7167.

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System Bootstrap, Version 12.3(8r)T9, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2004 by cisco Systems, Inc.
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GIO ASIC version 0x127
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0X0013          0X00035000 Card in slot 1
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PMem allocated: 117440512 bytes; IOMem allocated: 16777216 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, 2801 Software (C2801-IPBASE-M), Version 12.4(1c), RELEASE SO
FTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
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Title How to recover a password on the Cisco Wireless LAN Controller
Core Issue
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