I was tasked with upgrading an S8300D from CM 5.2 to 6.2 after all the preparation work on rebooting the S8300D it failed to load of the DVD and I was unable to ping the S8300D. The software was known to be good and I followed the manual to the letter but we ended up aborting the upgrade.
A number of things have come to light since, first if you are using Windows 7 see the Avaya video attached regards IPV4 address duplication and secondly ensure you have an approved Avaya DVD device.
Avaya approved Panasonic Digistor 73082 or 73322 (Comcode: 700406267)
theavayengineer.wordpress.com 
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