si si accende come se dovessi usarli ma appena lo stacco si spenge
prova con questo
Forcing Device into USB Mass Storage Mode:
1. With the device off, hold the lap key (left key)
2. Plug the device into a PC via a USB cable
3. Continue holding the lap key until Windows (or other OS) prompts you to explore the drive (should take about 10 - 15 seconds after plugging in the device)
https://forums.garmin.com/showthread.php?187958-EDGE-510-unable-to-format
Beibo