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| 1 | +## 6.1.0 |
| 2 | + |
| 3 | +### FEATURES |
| 4 | + |
| 5 | +- Ledger [#2715](https://github.com/particle-iot/device-os/pull/2715) [#2756](https://github.com/particle-iot/device-os/pull/2756) |
| 6 | +- [WiFi] `WiFi.setCredentials()` with credentials validation [#2746](https://github.com/particle-iot/device-os/pull/2746) [#2754](https://github.com/particle-iot/device-os/pull/2754) [#2758](https://github.com/particle-iot/device-os/pull/2758) |
| 7 | +- [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](https://github.com/particle-iot/device-os/pull/2766) |
| 8 | + |
| 9 | +### ENHANCEMENTS |
| 10 | + |
| 11 | +- [Cellular] Improve BG95 connection speed by only setting `nwscanseq` if needed [#2735](https://github.com/particle-iot/device-os/pull/2735) |
| 12 | +- Include IMEI in `CTRL_REQUEST_CELLULAR_GET_ICCID` control request [#2730](https://github.com/particle-iot/device-os/pull/2730) |
| 13 | +- Process system tasks while cloud handshake is in progress [#2745](https://github.com/particle-iot/device-os/pull/2745) |
| 14 | + |
| 15 | +### BUGFIXES |
| 16 | + |
| 17 | +- [wiring] Fix incorrect `int` to `bool` conversion in `WiFi.clearCredentials()` [#2736](https://github.com/particle-iot/device-os/pull/2736) |
| 18 | +- [Gen 4] [rtl872x] Fix boot loop if system-part module info is corrupted [#2739](https://github.com/particle-iot/device-os/pull/2739) |
| 19 | +- [Gen 4] [rtl872x] Fix OTA bounds check, add `ota/min_max_app_size` test [#2742](https://github.com/particle-iot/device-os/pull/2742) |
| 20 | +- Fix `std::call_once` re-entrancy problem [#2743](https://github.com/particle-iot/device-os/pull/2743) |
| 21 | +- Prevent OTA progress events from blocking system thread [#2741](https://github.com/particle-iot/device-os/pull/2741) |
| 22 | +- [Gen 4] [rtl872x] Fix WiFi/BLE coexistence and WiFi/BLE stability issues [#2747](https://github.com/particle-iot/device-os/pull/2747) [#2752](https://github.com/particle-iot/device-os/pull/2752) [#2755](https://github.com/particle-iot/device-os/pull/2755) [#2754](https://github.com/particle-iot/device-os/pull/2754) |
| 23 | +- [Gen 4] [rtl872x] Fix USB re-enumeration issues [#2744](https://github.com/particle-iot/device-os/pull/2744) [#2752](https://github.com/particle-iot/device-os/pull/2752) [#2754](https://github.com/particle-iot/device-os/pull/2754) |
| 24 | +- [Gen 4] [rtl872x] Fix incorrect timing of SPI TX-only transaction completion notification [#2749](https://github.com/particle-iot/device-os/pull/2749) [#2757](https://github.com/particle-iot/device-os/pull/2757) |
| 25 | +- [Gen 4] [rtl872x] Fix an issue with `micros()` and `millis()` occasionally jumping forward after ~37 hours [#2750](https://github.com/particle-iot/device-os/pull/2750) |
| 26 | +- [Cellular] [Quectel] Try to force open PPP channel, helps with warm boot PPP session resume in some cases [#2752](https://github.com/particle-iot/device-os/pull/2752) |
| 27 | +- [system] Fix sockfd matching in ACM connectivity manager causing a panic [#2755](https://github.com/particle-iot/device-os/pull/2755) |
| 28 | +- [Gen 4] [rtl872x] Fix UART initialization issue with non-32-byte-aligned buffers [#2757](https://github.com/particle-iot/device-os/pull/2757) |
| 29 | +- [Gen 4] [rtl872x] Reinitialize internal wifi stack if scan or connect fails [#2766](https://github.com/particle-iot/device-os/pull/2766) [#2760](https://github.com/particle-iot/device-os/pull/2760/) |
| 30 | +- [Gen 4] [rtl872x] Resolve deadlock with USB serial monitoring on boot in some cases[#2765](https://github.com/particle-iot/device-os/pull/2765) |
| 31 | + |
| 32 | +### INTERNAL |
| 33 | + |
| 34 | +- [Tracker] Disable ESP32 SDIO debug logs [#2740](https://github.com/particle-iot/device-os/pull/2740) |
| 35 | +- [GCC] Enable Ledger and filesystem APIs on GCC platform [#2737](https://github.com/particle-iot/device-os/pull/2737) |
| 36 | +- Fix monolithic build errors [#2751](https://github.com/particle-iot/device-os/pull/2751) |
| 37 | +- [Gen 4] [rtl872x] Upgrade `ambd_sdk` WiFi and BLE subsystems to `6.2_patch_integrated_231211_25b3bc38` [#2752](https://github.com/particle-iot/device-os/pull/2752) |
| 38 | +- Update USB/BLE platform names to use hyphenated notation [#2753](https://github.com/particle-iot/device-os/pull/2753) |
| 39 | +- [Gen 4] [rtl872x] Prevent M404/BG95M5 modems from connecting on 2G networks for the time being[#2761](https://github.com/particle-iot/device-os/pull/2761) |
| 40 | +- [Gen 4] [rtl872x] Query 2G registration status for M404/BG95M5 modems when querying CGMI [#2761](https://github.com/particle-iot/device-os/pull/2761) |
| 41 | + |
1 | 42 | ## 6.0.0
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2 | 43 |
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3 | 44 | ### FEATURES
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