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V2110 fails to upgrade to 10.11.01 with error "This kernel requires an x86-64 CPU, but only detected an i686 CPU."

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TitleV2110 fails to upgrade to 10.11.01 with error "This kernel requires an x86-64 CPU, but only detected an i686 CPU."
Symptoms
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."
Environment
  • ExtremeWireless
  • IdentiFi
  • V2110
  • Upgrade Firmware 10.11.01 or newer
  • Current Firmware 10.01.06 and older
  • ESXi
  • 64-bit
Cause
  • 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.  

 
Resolution
  • Reboot the ESXi server and navigate to the BIOS Setup screen during boot. 
  • In the BIOS set up, arrow down and select Virtualization Technology
User-added image

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!
Additional notes

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