As this an older sat nav with a limited memory, how can I update this sat nav to 2016 maps,I have updated the firmware/software version to 5.20 audio version is 2.30,gtm SW version 4.50,GPS SW version is 3.00 Bluetooth SW version 3.40,te latest maps are way to big to install on the device,will the device accept an SD card bigger than 2 GB will the device read from SD card what file extension would it need to be in and where can I download maps to an SD card please
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