You may need to install USB-to-Serial drivers (like PL2303 or CH340) so your PC can talk to the meter's internal bridge.
: Ensure the device is powered on. Many users recommend checking that the battery is fully charged before starting to avoid power failure during the update. satlink ws 6933 software update work
When the tool says “Upgrade Successful,” close the software and unplug the USB cable. You may need to install USB-to-Serial drivers (like