I have one Summit x450a-24t which doesn't boot. I tried to boot pri/sec images (boot 1/boot 2) and diagnostic (boot 3/boot 4) from BootPROM, but unsuccessfully. Boot hangs on "Failed to determine exact hardware type for the SummitX platform" message.
=====================================Running POST... PASSED
Version 126.96.36.199 Branch trunk by release-manager on Fri 04/20/07
Copyright 2003-2007, Extreme Networks, Inc.
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Failed to determine exact hardware type for the SummitX platform!
This hardware is not supported by this software release. Please see the
ExtremeWare XOS Concepts Guide for information on installing a newer
software release. See the Release Notes for your hardware to verify the
supported ExtremeWare XOS releases.[/code][/code] (from demyan)