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Good day. Thank you for your question.
May I know if you are using the latest .NET Framework version as suggested on our Wiki page - https://wiki.teltonika-gps.com/view/FMB920_First_Start#Configuration_.28Windows.29
Alternatively, you may download the latest Framework from this link - https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-desktop-5.0.13-windows-x86-installer
Additionally, please go through the steps on how to start using our devices here - https://wiki.teltonika-gps.com/view/FMB920_First_Start
If you are still facing difficulties, please reach out to us via VIP Helpdesk or contact your Sales Manager/Distributor. If you don't have any contacts with our Sales managers, please contact them on our official website https://teltonika-gps.com/ and click on the "Contact Us" button. When you will click, please fill out the form and submit it.
Note: as a topic, please choose "Vehicle Telematics".
Or you can send an e-mail with the description of your situation to firstname.lastname@example.org