[UPDATED for ios7 beta] “We’re unable to complete your activation”, solution for those with the Apple developer program [UPDATED for ios7 beta]

[update 11-06-2013] I ran into issues with ios7 beta where my newly registered device was not recognised. I tried a number of things e.g. activating via a different connection instead of iTunes, downgrading back down via DFU mode. The only thing that worked was to do a Shift+Update (or Option+Update)…

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