If you flashed FULL dezl 580 system fw to it thereby changing the HWID you can connect directly to GarminExpress to see if it offers more specific BT firmware for dezl. If you used hybrid fw with DS50 boot.bin and dezl 580 fw_all.bin etc., retaining the DS's original HWID, you should avoid using GE directly and instead copy the GarminDevice.xml (with the HWID changed for dezl) into a Garmin root folder on a USB stick or media card to use as a 'stunt-double' (i.e. a clone) of your device. If it updates then copy the relative files to appropriate places on your device.
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