You may have better luck with 'show image version'
Default boot signifies which version you're running on boot-time
(Aruba3600-117) #show image version
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Partition : 0:0 (/dev/hda1) **Default boot**
Software Version : ArubaOS 6.3.0.0 (Digitally Signed - Production Build)
Build number : 38241
Label : 38241
Built on : Thu May 2 20:40:35 PDT 2013
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Partition : 0:1 (/dev/hda2)
Software Version : ArubaOS 6.3.1.0 (Digitally Signed - Production Build)
Build number : 39611
Label : 39611
Built on : Tue Aug 27 08:26:28 PDT 2013