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J-Link can't connect to nRF51 Dongle

I was trying to install firmware into my nRF51 Dongle using jlink.exe on Windows, so I can use nRF Sniffer.  I made the mistake of unplugging the dongle from USB after erasing the existing firmware but before installing the new.  Now when I run jlink with the dongle plugged in, it says "Cannot connect to J-Link via USB."  How do I recover from this?  Thanks!

- Dave

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