v6.4.1 (Argon/Boron/B-SoM/B5-SoM/Tracker/Tracker-M/E-SoM-X/M-SoM/P2)

Device OS 6.4.1 Release is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B-SoM/B5-SoM/Tracker/Tracker-M/E-SoM-X/M-SoM/P2).

Released on May 4th, 2026

See documentation about Device OS versions, their current state, upgrades and downgrades here.

---

6.4.1

FEATURES

• USB (Serial) tethering support #2898 #2912
• [Gen 4] Serial1 tethering support #2910
• [Cellular] API for sending APDUs #2915

ENHANCEMENTS

• [Cellular] BG95S5 cellular env vars support #2908
• Support detecting/configuring M-HAT in Tinker #2914

BUGFIXES

• [Gen 4] Allows longer duration sleep with AM1805 (external RTC) #2907
• [Tracker] Expose deprecated hal_exrtc_ functions #2907
• [Gen 4] Add locking around logical eFuse reads #2909
• [Gen 4] [scripts] fix rtl872x.tcl flash script to be more reliable #2911
• Filesystem initialization in bootloader should create /sys folder #2917

INTERNAL

• manufacturing/empty_external_flash test #2917

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v6.4.1/particle_device-os@6.4.1.zip