dezl 770 software version 5.30 . as of December 3, 2018. Use Garmin Express to install this file. (61.23 MB) View system requirements. Notes: WARNING: If this software is uploaded to a device other than that for which it is designed, you will not be able to operate that device. If attempts to upload software fail, you may need to return the device to Garmin® for service.
https://www8.garmin.com/support/download_details.jsp?id=7267
