Small correction. 650 is supported. only the 651 controller will be converted to 650.
ArubaOS 6.2.x is supported only on the newer MIPS controllers (7200 Series, M3, 3400, 3600, 600 Series,
3200XM, and any 3200 with its memory upgraded using 3200-MEM-UG kit).
Legacy PPC controllers (200, 800, 2400, SC1 and SC2) and 3200 (default memory) are not supported. DO
NOT upgrade to 6.2.x if your deployments contain a mix of MIPS and PPC controllers in a master-local
setup.
Upon upgrade to ArubaOS 6.2, the internal AP of the 651 controller will be disabled. The controller will
then operate as a 650 controller.
Reference:
http://support.arubanetworks.com/DesktopModules/Bring2mind/DMX/Download.aspx?TabId=75&DMXModule=510&Command=Core_Download&EntryId=10405&PortalId=0