ecostin's is 3G. Just tried on the same version - don't work. A plausible explanation may be that as part of the initialization and initial registration process in-house the test files are normally deleted. In this case the test files failed to be removed for some reason and stayed in the unit (perhaps the tester forgot to execute a cleanup command). And it so happened that the owner of this unit actually knew what to do with his treasure, which would have been quite unlikely.