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Do you need to upgrade to the latest firmware?  Check which version you are currently running:

Touch the SETTINGS icon (see red circle below).

Touch DEVICE SETUP (see red circle below).

Touch ABOUT (see red circle below).

Device Settings Screen for DVT Firmware Upgrade

Take note of which firmware version your instrument is running (see red circle below).

About Screen for the DVT Firmware Upgrade

For Immediate assistance,
Call 1-508-946-6200 (US ET)
Monday - Friday from 8:00AM - 5:00PM