Use Explorer and look in your specific map folder (USA_Canada??) See if there are any cspeechxxx.dat files. If so, remove them. They are meant for Advanced Speech Recognition models which the 540 is not (requires a microphone).
These files are NOT for text to speech.
You can't delete some pois from the poi.dat file included.
You can use Home's Manage my DEvice, device tab, to remove any recorded voices (not computer) that you might have installed. Use Explorer to go to the art/cars folder and remove any car icons you won't need. Go to the license folder and delete any files without US_ENG in the filename. If there is anything in the raster folder, you can probably delete it.
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