Latest Version 5.12.4
Release Date: December 14, 2025
This release fixed a few bugs:
- Fixed issues handling raw CAN frames when using ISO 15765
- Fixed incorrect behavior when CAN transmissions are aborted
- Fixed incorrect error being reported when communicating on a disconnected bus
- Fixed issue where ISO 11898 messages were dropped when using ISO 15765
- Fixed an issue where CAN multi-frame message transmission would cause the device to lock up after 35 minutes of uptime
- Fixed handling of ATCRA, ATCF, and ATCM so their values are preserved when ATSP or ATTP are issued, matching ELM327 behavior
- Fixed rare issue where an overflow condition could reduce message delay times
- Fixed rare ISO 15765 flow-control frame transmission failure during concurrent multi-frame reception
- Fixed INTERNAL ERROR when receiving more multi-frame messages than specified
- Fixed ATCRA not restoring default filters when used without a parameter
- Fixed bug, STPX now properly sends 29-bit CAN messages when the AT/ST protocol is configured to 11-bit CAN
This release also added a few new features and a change:
- Added the Batched Commands feature, which supports sending multiple commands/requests in a single prompt
- Added the STBC command for enabling and disabling the Batched Commands feature
- Added the STBCOF command, which sets the output format for batched commands
- Added an optional parameter to STM and STMA commands to exit monitoring after reaching the specified message count
- Added the STITW command to set ISO protocol W timings
- STCSTM now also sets ISO 11898 inter-frame delay for segmented messages
See obdlink_ex-changelog.txt inside the archive for detailed descriptions of the changes.
To install an update via the OBDLink app, navigate to ‘Settings’ > ‘Firmware Updates’, then click ‘Check For Updates’
To install an update via a Windows PC, download and extract the archive, then run StnFirmwareUpdater.exe
Firmware Updates for STN Firmware Update Utility
The new STN Firmware Update Utility searches for connected devices and automatically finds available firmware.
Once installed tap the Search for Device button, if multiple devices are connected you will be prompted to select your desired device.