This is interesting seeing that the files belong to an earlier map version. Normally it is a 'no no' to have such files present with a different map 'cos it can cause problems, not prevent them.
Perhaps this non-Garmin unit just needs to see such file types present regardless of their content during the loading process. If the map being loaded is locked and the files don't match it's FID or the Unit ID then no doubt the unit would display some message like 'Can't unlock/authenticate Maps' on boot-up.



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