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WLC 2006 upgrade failed.

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Dear all,

I have met this situation during the upgrade of WLC 2006 controller.

==== Screen output ====

(Cisco Controller) >transfer download start

Mode............................................. TFTP
Data Type........................................ Code
TFTP Server IP................................... 192.168.0.106
TFTP Packet Timeout.............................. 6
TFTP Max Retries................................. 10
TFTP Path........................................ ./
TFTP Filename.................................... AIR-WLC2006-K9-4-0-217-0.aes

This may take some time.
Are you sure you want to start? (y/N) Y

TFTP Code transfer starting.

TFTP receive complete... extracting components.

Failure while validating the signature!

TFTP Failure while storing in flash!

(Cisco Controller) >

==== End of output ====

It seems that couldn't validate the signature while it unpack it.  Could anyone suggest how could I do in the nex step?

The curren version is :

(Cisco Controller) >show sysinfo

Manufacturer's Name.............................. Cisco Systems Inc.
Product Name..................................... Cisco Controller
Product Version.................................. 4.0.206.0
RTOS Version..................................... 4.0.206.0
Bootloader Version............................... 4.1.171.0
Build Type....................................... DATA + WPS
Compact Flash Size............................... 256 MB

System Name...................................... Cisco_06:00:10
System Location..................................
System Contact...................................
System ObjectID.................................. 1.3.6.1.4.1.14179.1.1.4.2
IP Address....................................... 192.168.0.41
System Up Time................................... 0 days 1 hrs 26 mins 13 secs

Configured Country............................... Taiwan

State of 802.11b Network......................... Enabled
State of 802.11a Network......................... Enabled
Number of WLANs.................................. 1
3rd Party Access Point Support................... Disabled

Number of Active Clients......................... 0

Burned-in MAC Address............................ 00:0B:85:06:00:10

(Cisco Controller) >