No, you definitely can't convert any Garmin in that way. Garmin devices are 'localized' to a certain OEM map area. So even if (say) US, EU, SA, AU etc. localized devices of the same model have the same HWID and use the same firmware you cannot change the localization to another. You can load unofficial unlocked maps for another area however. To be completely legal you should just buy them of course.
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