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Any time George.
What got me intrigued is that lens firmware is user upgradable (via compatible EOS body).
So I don't know why they didn't provide a file download and instead wanted the lenses at the service centre. :shrug:
Ivan, I've heard varying reports about this, and you may know better, but I believe although you can check the software on 1 Dx and 5 D3, a special piece of equipment is required for the actual upgrade.