If only Milena works on Nuvi 500! I will check it when I will go to camp. That unit have used TTS(v) files. No support for this voice format on European\American units of 2x5! It was checked on old files for other language in this format. May be Asian software supports this format...
As for all others addition update in rgn file - simply delete first 60 byte in file and rename to proprietary name. If you do not know proprietary name you can find it in garmindevice.xml, webupdater find it in in the same place! I use script in WinHex what contains one command for this simple operation.
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