Particle Tools Changelog

September 26th 2023: Device OS v4.2.0

Note: This is a Release and may be used for production. This is the 4th Release in the Device OS release 4.x line (LTS) with critical bugfixes and backports from 5.x release line

To learn more about LTS release line, read our blog post.

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



  • [Cellular] Enables UPSV=1 low power mode for R510 when idle for >=9.2s #2674
  • [services] add long long support to printf/scanf #2694 #2696
  • [wiring] Add 64-bit String conversions #2693 #2657
  • [wiring] json: 64-bit support #2695 #2657


  • Fixes clean target for applications with large number of files + P2 PSRAM size calculation issues #2661
  • [gen3] hal: fixes the issue that UARTE RX may lose data #2698
  • [quectel] Fixes ncp-client not waiting for modem ready on cold boot #2700

... and other bugfixes and improvements!

:star2: Be sure to read the full collection of release notes Particle Device OS Updates Thread.

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