This problem is due to Cisco bug ID CSCsg18356. This appears in the window during the boot process:Booting Primary Image... Choose now for additional boot options...
Choose one of these options:
1. Run primary image (Version 184.108.40.206) (active) 2. Run backup image (Version 220.127.116.11) 3. Manually upgrade primary image 4. Change active boot image 5. Clear Configuration
Please enter your choice: 5 Detecting hardware . . . . Clearing system configuration: done.
Configuration has been cleared. Restarting...Then, this error message appears on the console at boot time: Cisco AireOS Version 18.104.22.168 Initializing OS Services: Failed to open /mnt/application/eeprom.dat.Cisco Crash Handler This build was configured to copy this crash information to a file called: "/mnt/application/mwar_dump1.crash"
When the configuration is cleared with option 5 from the boot menu, the eeprom.dat file does not backup and is deleted. This file holds the serial number, the MAC address, and other information that is related to the box. Without this file, the WLC 2006 cannot boot and the unit must be replaced.
Make sure following steps are completed before option 5 is used
Update the _ER.aes file on the controller.
2. Update the controller to version 22.214.171.124.
Until those steps are complete, do not use option 5 from the boot menu on the WLC 2006 controllers that run these firmware versions:
If the configuration is cleared without the completion of those steps, the hardware must be replaced.