FMB641 firmware errata

Introduction

We are always improving our devices performance, stability and reliability. That’s why Teltonika is one of the leading GNSS trackers manufacturers in the world.
This document describes FMB641 devices firmware improvements, changes, new features implementations as well as current firmware release version.

Firmware versioning

• Structure

 FM.VER.[XX].[YY].[ZZ]

• Syntax description
  • XX – client number. Value range: 00 – Teltonika, 02..99 – Specific clients
  • YY – branch number, shows major changes in firmware, i.e. new module support added or new major feature added.
  • ZZ – minor changes like small fixes, improvements and new minor features addition.

Firmware versions

FIRMWARE VERSION	RELEASE DATE	CHANGES
02.02.17.Rev.11 (Latest firmware release version for FMX641)	2026.06.08	General Resolved high CPU usage that could affect device performance and responsiveness. Fixed AVL records from the SD card no longer being sent until a manual restart. Connectivity & Server Communication Device now checks for and responds to SMS commands while in Online Deep Sleep (ODS) mode. Fixed FOTA WEB update failure after a hard reset when the configured Server 1 address is unavailable. Fixed corrupted UDP data when AVL records exceed 512 bytes Tachograph & DDD Fixed "unexpected file type" error during VDO Gen2v2 DDD file download. Improved WEB TACHO link timeout handling for Stoneridge tachographs — the 15-minute timeout is now extended on each server response, preventing premature disconnection during prolonged authentication (BUSY responses). CAN & LV-CAN Fixed LV-CAN200 not accepting certain program numbers (e.g., 13853); the device now returns the configured value correctly.
02.02.17.Rev.04	2023.06.02	NEW! Smart Tachograph Generation 2 Version 2 support added CAN termination parameter ID changed Added "Not Available" option for driver state filter if tachograph working in private mode Improvements for tachograph DDD files download communication Records generation and sending improvements
02.02.16.Rev.03	2023.02.24	CAN data receiving improvements Implemented ignition counter OneWire functionalities improvements Stability improvements RS232 configuration improvements J1708 functionality improvements
02.02.15.Rev.06	2022.10.07	Tachograph data reading improvements Sleep modes improvements Immobilizer functionality improvements Analog data reading improvements DOUT stability improvements CAN bus modes improvements Newly added Contipressure IOs Iridium Edge support added LVCAN support added (Via COM1/COM2) Improvements FMB641 1-wire stability with 6 temperature sensors
02.02.09.Rev.00	2022.04.29	Improved SD card logging Improved Impulse Counter functionality Improved time of waking up from Deep Sleep Enhanced SIM detection
02.02.06.Rev.04	2022.03.18	Improved CAN Terminator switch functionality Live Tachograph data Priority parameter setting over SMS/GPRS improvement FMS/DDD CAN line source configuration improved
02.02.05.Rev.02	2022.01.28	GPRS command sending/execution improvements
02.02.04.Rev.00 (Initial firmware used in factory)	2021.12.20	Initial Firmware released