| 2.6.4 | May 29, 2026 | Open | Eval | New - Completed migration of all demo projects to the modular CMake build system
- Added support for STM32L5xx (Cortex-M33) family
- Added demo projects on NUCLEO-L552ZE-Q board showcasing Dual-Bank and Hybrid configurations with UART/Y-Modem protocol
- Added demo project on STM32H573I-DK board showcasing Dual-Bank configuration with HTTP server protocol
- Added CM7 + CM4 demo projects on NUCLEO-H755ZI-Q (dual-core MCU) showcasing Dual-Bank configuration with UART/Y-Modem protocol
Improvements - Improved ImageBuilder tool to support backward compatibility of update images built with legacy header versions (added CLI flag to explicitly select the image header version when creating firmware images)
Bug Fixes - Fixed issue in STM32H7xx and STM32U5xx drivers impacting fallback when all slots are within MCU internal FLASH
- Renamed residual DUAL_BANK compile-time flags to FLASH_DB_MODE in the STM32H7xx, STM32H5xx, STM32L4xx, and STM32U5xx internal flash drivers to eliminate a naming conflict with the identically named STM32 HAL macro.
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| 2.6.2 | Apr. 16, 2026 | Open | Eval | New - Added a demo project showcasing the standalone bootloader with a TFTP server on Nucleo-F439ZI board
Improvements - Refactored first-stage bootloader with two new files and extended its context structure
- Improved update library operation with fallback support for standalone operating mode
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| 2.6.0 | Feb. 09, 2026 | Open | Eval | New - Added application firmware verification performed on every boot by the second-stage bootloader, using digital signatures (ECDSA or RSA) or integrity checks (SHA-1/SHA-2)
- Added signature key generation support to the ImageBuilder tool
- Added demo projects for STM32H573I-DK showcasing new Secure Boot features and the use of UART/Y-Modem, USB-CDC, or HTTPS client protocols
Improvements - Added support for the HMAC-DRBG algorithm for random number generation, in addition to Yarrow
Bug Fixes - Fixed bugs in the Mailbox API related to encryption key retrieval
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| 2.5.4 | Sept. 26, 2025 | Open | Eval | New - Added support for multi-stage bootloader architecture, including an optional immutable first-stage bootloader to enable updatability of the second stage
- Added support for standalone bootloader mode, enabling the bootloader to manage the entire firmware update process including reception, validation, and installation
- Added support for "last operation" flag so that the application can detect a fallback operation or a successful firmware update
- Added demo projects to showcase new update scenarios:
- Multi-stage bootloader demo on NUCLEO-L476RG using UART/Y-Modem protocol
- Standalone bootloader demo on STM32H750B-DK using UART/Y-Modem protocol
Improvements - Added support for complex firmware versions
- Fixed an edge case in fallback operation (fallback with both the current app and its backup corrupted)
- Fixed an incorrect loop termination bug in STM32H5 internal flash driver
- Extended user callback code and hook functions to intercept various second stage bootloader operations
- Introduced C++ guards in header files for mixed-language projects
- Refined demo project structure and naming (hybrid_app_bl, iap_dual_bank, standalone_bl) for clearer representation of various firmware update scenarios
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| 2.5.2 | June 6, 2025 | Open | Eval | New - Added support for automatic firmware fallback to the last known working version if the firmware update image is unstable or corrupted, or if the current firmware is corrupted
- Added user-definable callback functions in bootloader operations to allow custom code execution, such as implementing a failsafe mode in case of issues with the update or current firmware image
- Added CMake as a supported build system for the following boards: Nucleo-H563ZI, Nucleo-H743ZI, Nucleo-H7A3ZI-Q, and STM32H753I-EVAL. In future releases, CMake support will be expanded and standardized.
- Added new demo projects for Nucleo-H563ZI (Single Bank, demo with HTTP server) and STM32F769I-EVAL (Single Bank + External Memory, demo with MQTT client)
Improvements - As part of the multi-stage bootloader feature on our roadmap, the following changes have been made to the bootloader implementation:
- `static_bootloader` is renamed to `second_stage_bootloader` (note: the next release will include a `first_stage_bootloader`, which will enable updates to the `second_stage_bootloader`)
- Improvements to the bootloader's finite state machine
- Fixed memory related issue in ImageBuilder utility
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| 2.5.0 | Feb. 10, 2025 | Open | Eval | Version Change Notice - In this release, we are aligning the version numbering of CycloneBOOT with the versioning scheme used for all our other software products, ensuring a consistent versioning structure across all our software.
- The version change is driven by our shared dependency on the 2.5.0 version of the cryptographic library (CycloneCRYPTO), now consistent across all of our security products.
- As part of this alignment, the version of this new CycloneBOOT release is 2.5.0, succeeding the previous legacy version L.3.0.6. All future releases will follow the new versioning system (2.5.0+).
What this means for you: - The version number change does not affect the functionality or features of the product. The underlying product remains the same, with updates and improvements applied as usual.
- Any major changes will be highlighted as usual
Improvements - CycloneCRYPTO library has been updated to version 2.5.0
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| L.3.0.6 Legacy version | Dec. 13, 2024 | Open | Eval | New - Add support for STM32H5 family
- New evaluation board supported (Nucleo-H563ZI)
- Add SFTP Server demonstration project for Nucleo-STM32H563ZI board
Improvements - CycloneCRYPTO library has been updated to version 2.4.4
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| L.3.0.4 Legacy version | May 31, 2024 | Open | Eval | New - New evaluation boards supported (Nucleo-H743ZI2 from STMicroelectronics and SAM E54 XPlained Pro from Microchip)
- Update Library:
- Added safe-guards against mismatching AES keys on the update server and on the embedded device
- ImageBuilder utility:
- Added HASH-based encryption key verification logic to update image
- Added support for encryption and authentication keys in both ASCII and HEX formats
Improvements - Improved memory slot management with an abstraction layer to safeguard against any overflows and run-time errors related to bad memory slot configuration
- Added support for dual-bank fallback mode on STM32U5 family
- CycloneCRYPTO library has been updated to version 2.4.2
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| L.3.0.2 Legacy version | Feb. 5, 2024 | Open | Eval | New - Added support for In-Application Programming (IAP) using Single Bank MCU without necessitating an external memory (demo project available for STM32F769I-EVAL evaluation board)
- New evaluation boards supported (Nucleo-L496ZG, Nucleo-F429ZI, Nucleo-F767ZI, Nucleo-H7A3ZI-Q, STM32F769I-DISCOVERY)
Improvements - Clearly distinguished IAP Single Bank demos: those requiring external flash (iap-single-bank-ext-mem/) and those using only MCU internal flash (iap-single-bank/)
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| L.3.0.0 Legacy version | Dec. 18, 2023 | Open | Eval | New - Various demonstration projects for Nucleo-U575ZI-Q, Nucleo-H743ZI2, STM32429I-EVAL, STM32F769I-EVAL and STM32H753I-EVAL2 evaluation boards
- Revamped READMEs for our demonstration projects, making them much more user-friendly and easy to understand
Improvements - Internal re-structuring of modules for better code reuse
- Reorganization of memory related functions for more flexibility and portability across different use cases
- Improvements to ImageBuilder PC utility (formerly AppImageBuilder) to better manage boot offset required by different MCU families
- CycloneCRYPTO library has been updated to version 2.3.4
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| L.2.1.0 Legacy version | Dec. 23, 2022 | Open | Eval | New - Introduction of new error codes for specific firmware update related error scenarios. The list of error codes will be expanded gradually in upcoming releases.
- AppImageBuilder CLI utility has been completely overhauled. The source code for the utility is also now available. Multiplatform support (Windows/Linux) alongside POSIX compatible CLI parameters/flags have been added. CMake based toolchain is now used to build the project and to facilitate compilation on a number of different OS’s.
Improvements - CycloneCRYPTO library has been updated to version 2.2.0
- Reorganization of security related (authentication, signature, and integrity verification) modules into a separate package to better code reuse
- All HTTP server demo projects will now display a message in the HTML UI, if an error occurs during firmware update process
- Added new demonstration projects for Nucleo-H743ZI2 (HTTP Server Dual Bank Demo, HTTPS Client Dual Bank Demo)
Bug Fixes - Reworked ECDSA verification process
- Correct some edge-cases related to Single Bank update image processing (with the static bootloader)
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| L.2.0.2 Legacy version | Jul. 29, 2022 | Open | Eval | New - Added new demo boards (Nucleo-STM32H7A3-ZIQ, Nucleo-STM32L496-ZG, SAME54-Xplained-Pro)
- Added new demo projects on STM32 evaluation boards (IAP Demo through USB/RNDIS with HTTP Server protocol, IAP Demo through UART with Y-Modem protocol)
Improvements - Improved parsing process for the image update
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| L.2.0.0 Legacy version | Mar. 25, 2022 | Open | Eval | New - Added support for Single Bank MCUs
- Added support for external flash memory devices through an abstraction layer
- Included a static bootloader to perform advanced firmware update scenarios
- Added support for Fallback & Anti-rollback features during firmware update
- Added demo projects for STM32 targets (Nucleo-F429ZI, Nucleo-F767ZI, STM32F769I-DISCO evaluation boards)
Improvements - CycloneBOOT architecture has been revamped to incorporate Single Bank MCU support (with external memory)
- Expanded Cryptographic algorithms support for firmware security
- Added a Linux binary of ApplicationImageBuilder utility, used to create firmware update images
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| L.1.0.1 Legacy version | Apr. 09, 2021 | Open | - Legacy CycloneBOOT demonstration package (IAP library) for STM32F4 and STM32F7 MCUs with Dual Bank internal MCU Flash
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