To me, this is an RMA case. I am not too sure if manually upgrading the bootloader from the CLI without TAC assistance is a good idea... you seem to know grub, but the system performs a hardware checksum check before starting up, and it looks like that's what failed in you case...
Some very good new for everyone who has experienced this very frustrating error. I have found a resolution to this problem (well it fixed my issue, which certainly seems extremely similar to this one)...
Type what you see following the Grub command prompt...
A WLC526, WLC2006, WLC2106 or NM-AIR-WLC6 may seen to display a
"grub>" prompt on the console port. It will be unable to boot the
WLC software and will not be able to operate normally.
For AIR-WLC526 / AIR-WLC2006 / AIR-WLC2106:
From the grub prompt use the following commands to boot primary image
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
The 1st installment is a table of advanced filters. More filters will be added as time allows.
It is a living doc, so check back for changes every so often
Please feel ...
I have created a Powershell script to automatically add a Wireless Guest User on Cisco WLCs. (tested on 2500 Series)
The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...