It is possible that your device may not work properly after an update or something else.
Please make a few checks beforehand:
Check the power supply, make it 12 V;
Check if .Net framework is installed and up to date;
You can check here: https://wiki.teltonika-gps.com/view/FMB640_First_Start#PC_Connection_.28Windows.29
Please, try to use another power supply;
If external voltage is correct, please, check if device is visible in device manager;
It is possible that the firmware is not supported by the configurator;
You can check here: https://wiki.teltonika-gps.com/view/Teltonika_Configurator_versions#For_FMB640
After checking the different instructions above:
You can contact the support (support@mirifica.de) to have the “Firmware Updater” that will allow you to flash your device.
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