Particle Device OS Updates Thread

Device OS 5.5.0 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 August 31, 2023

Note: This is a Release and may be used for production.

This is a release on non-LTS feature development branch (5.x). To learn more about our new LTS release line, read our blog post.

You can view information about Device OS versions, upgrades and downgrades here.

Gen 3 256KB application binary support

Device OS v3.1.x and further releases bring support for 256KB application binaries to all Gen 3 platforms (at that time: Argon, Boron, B SoM, B5 SoM, Tracker). A few important aspects of this change:

  1. Compatibility with 128KB applications built with < Device OS 3.1 versions is maintained. Devices can still run them even if other parts have been upgraded to Device OS 3.1+.
  2. Upgrade process OTA (including product-based upgrades) is transparent.
  3. When upgrading locally (using DFU or Serial), make sure to update the bootloader first, as it has some logic managing compatibility between 128KB and 256KB application types. See this page on steps how to perform the update.
  4. If using standalone Particle CLI installation, make sure it's updated to >= 2.12.0 version, which includes support for 256KB applications.



  • Asset OTA #2668
  • [M SoM] Platform support #2681
  • [rtl872x] Experimental WPA3 support #2673
  • [WiFi] Hidden SSID support #2673
  • [rtl872x] GPIO drive strength configuration support #2680


  • [WiFi] WiFI interface power state notifications #2669
  • [rtl872x] Improve SPI1 (P2 / Tracker M) and SPI (M SoM) behavior at 50MHz by changing RXD sample delay #2677
  • [rtl872x] Improve USB Serial TX performance #2672
  • [Cellular] Enables UPSV=1 low power mode for R510 when idle for >=9.2s #2674
  • [rtl872x] Fix logic level overshoot on SPI, I2C, PWM pins #2680
  • [rtl872x] Revert the QSPI flash speed to 80MHz #2684
  • Update the key used for validating the ServerMoved signature #2688
  • [rtl872x] remove the delay in UART flush() #2686


  • [rtl872x] Fix incorrect I2C read timeout #2671
  • [rtl872x] Do not initialize RTC after waking up from HIBERNATE sleep #2667
  • [rtl872x] Disable pull resistors when pin is configure as OUTPUT #2666
  • [rtl872x] Disable SWDIO/SWDCLK pins when going into sleep #2666
  • [rtl872x] Disable brown-out detector #2679
  • [rtl872x] Avoid glitch on I2C pins when reconfiguring I2C peripheral #2682
  • [msom] Fix ethernet cs, reset, interrupt GPIO pins for M2 eval #2690


  • [WiFi] Resolve wiring/sleep20 test failures #2669
  • [nrf52840] Add factory reset test (ota/factory_reset) #2662

System Binaries (all devices)

Programming and Debugging

You can view specific programming and debugging notes for this version of firmware here.