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You can check here: https://wiki.teltonika-gps.com/view/Teltonika_Configurator_versions#For_FMB640
After checking the
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different instructions above:
you can ask us You can contact the support (support@mirifica.de) to have the “Firmware Updater” that will allow you to flash your device.
How to make a hard reset:
You can manually reset device by plugging device power OFF and back ON, Unplug the connector.