V2110 fails to upgrade to 10.11.01 with error "This kernel requires an x86-64 CPU, but only detected an i686 CPU."
On upgrade to 10.11.01 or newer, the V2110 Console shows the error
"This kernel requires an x86-64 CPU, but only detected an i686 CPU. Unable to boot - please use a kernel appropriate for your CPU."
Upgrade Firmware 10.11.01 or newer
Current Firmware 10.01.06 and older
The ESXi server is not running a 64-bit OS.
The ESXi server has a 64-bit OS, but has Virtualization Technology (VT) disabled !
During install, there is an option to Enable Virtualization Technology. If this is not enabled, the ESXi server essentially runs as a 32-bit OS. The V2110 (and all ExtremeWireless controllers move to a 64-bit version in version 10.11, so this needs to be enabled on the server.
Reboot the ESXi server and navigate to the BIOS Setup screen during boot.
In the BIOS set up, arrow down and select Virtualization Technology
Notice that it says 64-bit is set. This is misleading.
Enable VT and Save and Exit
Boot ESXi server and perform upgrade.
NOTE: Even if you are not upgrading to version 10.11.01 or newer, it is recommended that you enable VT on your server!