Got it, but unfortunately this device.xml doesn't look like original file taken from your mio. There are some important and unique information missing there..Well, it doesn't matter, you can try this unlock:

Spoiler: link

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1. Extract and copy all files to your Mio flash disk (delete everything from the flash disk first, leave only your device.xml file).
2. Power OFF/ON device and device should boot into new menu. From there you can launch iGO Primo.

fingers crossed