I can not comment on the previous entry to give an answer about the "SDK tool".
But the tool he has in mind is actually the tools for Windows Phone Developer Power Tools. If you connect, it initiates an update that installs the powertools runtime on the device.
Interestingly, I ran into this problem after the first success with deploying on the phone. But after rebooting Visual Studio, I had a deployment crash.
Unfortunately, this did not solve the problem for me.
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