RMPrepUSB V2.1.656 has always worked fine in Win8/8.1 64bit for me.
@macakbl
If your GarminDevice.xml file is also corrupted, you can see the HWID in preboot with G7toWin [Only registered and activated users can see links. ].
When all other reformatting methods have failed including RMPrepUSB i've had some success with the free version of this:
Code:Please Login or Register to see the links



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