read on another site about this issue
Some folks report that Garmin Language Guide stopped working after upgrading to v4.00, i.e. Nuvi will not pronounce words/phrases anymore; MP3 player is still working though
I got reply from Garmin:
Thank you for contacting Garmin International.
We are working on releasing another software update for the Nuvi 7X5 series to correct that issue. Please keep checking with the WebUpdater program for another update for your unit.