The operating system is still there, he's only deleted some folders/files it's not possible for him to have removed the actual OS.

Provided the device is capable of booting up, it would have re-written the file in the device's Garmin folder named GarminDevice.xml which tells GarminExpress which files are needed to restore it. So just download GE if you haven't already and try updating your DriveSmart:
Code:
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Thread moved to Garmin Discussion Section.