v6.1.0 (Argon/Boron/B SoM/B5 SoM/Tracker/E SoM X)

Device OS 6.1.0 Release is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B SoM/B5 SoM/Tracker/E SoM X).

Released on May 3, 2024

Note: This is a limited Release and may be used for production with approval from Particle.

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.

---

6.1.0

FEATURES

• Ledger #2715 #2756
• [WiFi] WiFi.setCredentials() with credentials validation #2746 #2754 #2758
• [Gen 4] [rtl872x] [BREAKING CHANGE] Backup RAM is no longer automatically written to flash periodically. Backup RAM will be saved when entering sleep. If users are going to reset, hal_backup_ram_sync() should be called first #2766

ENHANCEMENTS

• [Cellular] Improve BG95 connection speed by only setting nwscanseq if needed #2735
• Include IMEI in CTRL_REQUEST_CELLULAR_GET_ICCID control request #2730
• Process system tasks while cloud handshake is in progress #2745

BUGFIXES

• [wiring] Fix incorrect int to bool conversion in WiFi.clearCredentials() #2736
• [Gen 4] [rtl872x] Fix boot loop if system-part module info is corrupted #2739
• [Gen 4] [rtl872x] Fix OTA bounds check, add ota/min_max_app_size test #2742
• Fix std::call_once re-entrancy problem #2743
• Prevent OTA progress events from blocking system thread #2741
• [Gen 4] [rtl872x] Fix WiFi/BLE coexistence and WiFi/BLE stability issues #2747 #2752 #2755 #2754
• [Gen 4] [rtl872x] Fix USB re-enumeration issues #2744 #2752 #2754
• [Gen 4] [rtl872x] Fix incorrect timing of SPI TX-only transaction completion notification #2749 #2757
• [Gen 4] [rtl872x] Fix an issue with micros() and millis() occasionally jumping forward after ~37 hours #2750
• [Cellular] [Quectel] Try to force open PPP channel, helps with warm boot PPP session resume in some cases #2752
• [system] Fix sockfd matching in ACM connectivity manager causing a panic #2755
• [Gen 4] [rtl872x] Fix UART initialization issue with non-32-byte-aligned buffers #2757
• [Gen 4] [rtl872x] Reinitialize internal wifi stack if scan or connect fails #2766 #2760
• [Gen 4] [rtl872x] Resolve deadlock with USB serial monitoring on boot in some cases#2765

INTERNAL

• [Tracker] Disable ESP32 SDIO debug logs #2740
• [GCC] Enable Ledger and filesystem APIs on GCC platform #2737
• Fix monolithic build errors #2751
• [Gen 4] [rtl872x] Upgrade ambd_sdk WiFi and BLE subsystems to 6.2_patch_integrated_231211_25b3bc38 #2752
• Update USB/BLE platform names to use hyphenated notation #2753
• [Gen 4] [rtl872x] Prevent M404/BG95M5 modems from connecting on 2G networks for the time being#2761
• [Gen 4] [rtl872x] Query 2G registration status for M404/BG95M5 modems when querying CGMI #2761

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v6.1.0/particle_device-os@6.1.0.zip

---

Programming and Debugging

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

v5.8.0 (Argon/Boron/B-SoM/B5-SoM/Tracker/Tracker-M/E-SoM-X/M-SoM/P2)

Device OS 5.8.0 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 March 15, 2024

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.

---

5.8.0

FEATURES

• Ledger #2715 #2756
• [WiFi] WiFi.setCredentials() with credentials validation #2746 #2754 #2758

ENHANCEMENTS

• [Cellular] Improve BG95 connection speed by only setting nwscanseq if needed #2735
• Include IMEI in CTRL_REQUEST_CELLULAR_GET_ICCID control request #2730
• Process system tasks while cloud handshake is in progress #2745

BUGFIXES

• [wiring] Fix incorrect int to bool conversion in WiFi.clearCredentials() #2736
• [Gen 4] [rtl872x] Fix boot loop if system-part module info is corrupted #2739
• [Gen 4] [rtl872x] Fix OTA bounds check, add ota/min_max_app_size test #2742
• Fix std::call_once re-entrancy problem #2743
• Prevent OTA progress events from blocking system thread #2741
• [Gen 4] [rtl872x] Fix WiFi/BLE coexistence and WiFi/BLE stability issues #2747 #2752 #2755 #2754
• [Gen 4] [rtl872x] Fix USB re-enumeration issues #2744 #2752 #2754
• [Gen 4] [rtl872x] Fix incorrect timing of SPI TX-only transaction completion notification #2749 #2757
• [Gen 4] [rtl872x] Fix an issue with micros() and millis() occasionally jumping forward after ~37 hours #2750
• [Cellular] [Quectel] Try to force open PPP channel, helps with warm boot PPP session resume in some cases #2752
• [system] Fix sockfd matching in ACM connectivity manager causing a panic #2755
• [Gen 4] [rtl872x] Fix UART initialization issue with non-32-byte-aligned buffers #2757

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.8.0/particle_device-os@5.8.0.zip

---

Programming and Debugging

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

v6.0.0 (Argon/Boron/B SoM/B5 SoM/Tracker/E SoM X)

Device OS 6.0.0 Release is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B SoM/B5 SoM/Tracker/E SoM X).

Released on January 30, 2024

Note: This is a limited Release and may be used for production with approval from Particle.

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.

---

6.0.0

FEATURES

• Protected mode #2734

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v6.0.0/particle_device-os@6.0.0.zip

---

Programming and Debugging

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

v5.7.0 (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/M SoM/P2)

Device OS 5.7.0 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 January 24, 2024

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.

---

5.7.0

FEATURES

• Allow duplicates in BLE scan results if requested with BLE.scanWithFilter(BleScanFilter().allowDuplicates(true)) #2718

ENHANCEMENTS

• [P2 / M SoM] BLE: Dynamically adjust radio prioritization when both BLE and WiFi are active improving BLE scanning performance #2714
• ACM preferred()/prefer() API clean up #2717
• [M SoM] Adjust cloud keep-alive based on network connection #2716
• [M SoM] Enable session resumption #2722
• [P2 / M SoM] SPI performance improvements #2728 #2731
• [P2 / M SoM] Ethernet performance improvements #2728 #2731

BUGFIXES

• [P2 / M SoM] BLE scan results should be filtered for duplicates by default #2718
• Fix OpenOCD FreeRTOS thread list access (uxTopUsedPriority) #2723
• [Gen 3] BLE: Fix stack overflow in BLE timer callback #2725
• [Cellular] Fixes parsing of MCC/MNC with 00 or 000 MNC #2726
• [P2 / M SoM] Use security type from JoinNewNetwork request to connect to hidden networks #2724
• [build] include alignment into section size calculations #2719
• [P2 / M SoM] SPI slave mode bugfixes #2728 #2731
• [P2 / M SoM] USB TX hold-off mechanism should account for maximum transmit size #2729
• [P2 / M SoM] USB ISR worker thread priority below network threads priorities #2729

INTERNAL

• [M SoM] Make GNSS burn in test optional #2720
• [M SoM] Support for GNSS FQC test #2721

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.7.0/particle_device-os@5.7.0.zip

---

Programming and Debugging

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

v5.6.0 (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/M SoM/P2)

Device OS 5.6.0 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 December 7, 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.

---

5.6.0

FEATURES

• [msom] ACM basic support #2689

ENHANCEMENTS

• [wiring] Add 64-bit string conversions #2693
• [wiring] json: 64-bit support #2695
• [msom] increase NCP baudrate to 921600, doubling throughput #2706
• [network] Wiznet Ethernet performance improvements #2708

BUGFIXES

• [gen3] hal: fixes the issue that UARTE RX may loss data #2698
• [rtl872x] correctly handle SecureFault #2699
• Fixes ncp-client not waiting for modem ready on cold boot #2700
• [system] still pump system loop when SPARK_WLAN_SLEEP=1; Try to drain ISR task queue quicker #2702
• [rtl872x] Fix unintentional pin changes for Serial1 RTS/CTS #2703
• [rtl872x] fix multiple BLE issues #2710
• Asset OTA fixes #2711

INTERNAL

• [services] add long long support to printf/scanf #2694
• fix printf/scanf for floating point numbers, add tests [#2696](#2696
• [msom] support 16MB GD flash #2701
• [msom] Support burnin tests #2704
• [gen3] reduce flash usage #2705
• Erase factory reset app after test runner completes #2709
• Fix dual stack UDP bind behavior with LWIP_IPV6_DEFINES_ONLY #2712
• Update WB makefile version #2713

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.6.0/particle_device-os@5.6.0.zip

---

Programming and Debugging

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

v4.2.0 (Argon/Boron/B SoM/B5 SoM/Tracker/E SoM X)

Device OS 4.2.0 LTS is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B SoM/B5 SoM/Tracker/E SoM X).

Released on September 26th, 2023

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

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.

---

4.2.0

ENHANCEMENTS

• [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

BUGFIXES

• 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

INTERNAL

• [bootloader] remove nanopb dependency #2607
• test] resolve sleep20 test failures. #2669
• [nrf] Add Factory Reset Tests #2662
• Update the key used for validating the ServerMoved signature #2688
• [ci] fix macos builds #2683

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v4.2.0/particle_device-os@4.2.0.zip

---

Programming and Debugging

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

v5.5.0 (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/M SoM/P2)

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.

---

5.5.0

FEATURES

• 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

ENHANCEMENTS

• [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

BUGFIXES

• [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

INTERNAL

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

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.5.0/particle_device-os@5.5.0.zip

---

Programming and Debugging

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

v5.5.0-rc.1 (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/M SoM/P2)

Device OS 5.5.0-rc.1 Release Candidate 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 16th, 2023

Note: This is a Release Candidate and is not intended for production yet.

This is a Release Candidate 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.

---

5.5.0-rc.1

FEATURES

• 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

ENHANCEMENTS

• [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

BUGFIXES

• [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

INTERNAL

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

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.5.0-rc.1/particle_device-os@5.5.0-rc.1.zip

---

Programming and Debugging

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

v5.4.1 (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/P2)

Device OS 5.4.1 Release is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/P2).

Released on July 20, 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.

---

5.4.1

ENHANCEMENTS

• [rtl872x] dynamically enable Wi-Fi stack on demand #2664

BUGFIXES

• [rtl872x] linker: stop relying on .dynalib + .psram_text being contiguous and properly and similarly aligned within LMA and VMA, just copy them separately #2665
• [rtl872x] fix BLE race condition #2664

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.4.1/particle_device-os@5.4.1.zip

---

Programming and Debugging

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

v5.4.0 (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/P2)

Device OS 5.4.0 Release is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B SoM/B5 SoM/Tracker/Tracker M/E SoM X/P2).

Released on June 16, 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.

---

5.4.0

ENHANCEMENTS

• [rtl872x] USB HID Mouse/Keyboard support #2659

BUGFIXES

• Fix/nanopb string max size #2657
• Fixes clean target for applications with large number of files + P2 PSRAM size calculation issues #2661

INTERNAL

• [rtl872x] Allow KM4 SDK Bootloader images to boot #2656
• [rtl872x] Combined MFG firmware #2658

---

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v5.4.0/particle_device-os@5.4.0.zip

---

Programming and Debugging

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