Discovering the Software Version and Unit ID: Main Menu -> Setup -> System -> (Zoom) Software Version.
The date is showing as 2051. That's a known bug, and this page shows how to fix it by hard-resetting the device.
The gpsbabel package, in the Debian Archives and Ubuntu Repositories, can transfer waypoints, tracks, and routes (but not maps) to/from the device. See the online documentation. It's a command-line application. Here are some example commands:
gpsbabel -D9 # Debug verbose flag gpsbabel -i garmin,get_posn -f /dev/ttyUSB0 -o kml -F myposition.kml # Get current position gpsbabel -o garmin,power_off -F /dev/ttyS0 # Send power-off command