G'day mallard2,

Unfortunately, there's no support in dezl 560 software for ASR, but BT works so maybe if you convert it to a nuvi 2460 then ASR will work. Check the specs from Garmin.
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If you really want to use ASR and don't mind missing the dezl features such as Truck/Motor Home/Caravan profiles and Exit Services, try the reverse of this conversion here: [Only registered and activated users can see links. ]. Do it at least initially keeping the 560 boot.bin is my suggestion. AFAIK, the hardware is identical. Therefore like with converting 3760 to 3490 ASR should work.