EFI firmware update 1.1 installation on Intel Xserve running 10.5.3

When I recently attempted to install EFI firmware update 1.1 on an Intel Xserve running MacOSX 10.5.3, the software installer indicated that the computer did not need this update. However, the machine's current boot ROM version (XS11.0080.B01) is earlier than that apparently associated with the new firmware (XS21.006C.B06). Is this to be expected?

I'm having the same issue on both my late 2006 Intel Xserves (firewire port on the front). The 2007 Intel XServe (USB port on the front) updated just fine with SU. So I tried copying the app over from the Utilities folder on the new one but wouldn't run on the older Xserves.
Maybe the older ones don't require the update?

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