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Good day. Thank you for your question.
There is a custom firmware that uses TLS for encryption. However, we do not share firmware files/updater and other files in the community forum. but for more information about this topic of encryption please contact your sales manager. 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 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
Thank you for your understanding.