There are 3 distinct varieties of Garmin TTS voices specific to particular Garmin devices and they aren't interchangeable between devices that use different TTS. Drive devices use the third and latest type. Loading an earlier TTS/TTS2 will most likely at least result in an 'Incompatible Voice' message displayed and at worst could 'brick' the device requiring loading of cure f'ware to allow the offending file to be removed.
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