Month: 2026-01 — In LedgerHQ/ledger-secure-sdk, delivered features that improve privacy, UX, and maintainability while addressing critical APDU reliability. Key changes include removing the os_get_current_app_tag syscall and handling app identity directly from strings to reduce dependencies and protect user install parameters; removing the deprecated pending review screen to streamline user flow; eliminating an unused BER TLV parsing algorithm to simplify the codebase; and fixing buffer length and casting issues in APDU handling for version retrieval to boost reliability.

Month: 2025-12 Key features delivered: - Apex API Version Update to 1.0.4 for Compatibility: Updated API level information to include Apex version 1.0.4, enabling compatibility with latest features and fixes. Major bugs fixed: - None reported this month. Overall impact and accomplishments: - Improved compatibility of LedgerHQ/ledger-secure-sdk with the latest Apex platform, reducing integration risk and enabling faster feature adoption downstream. - Maintained a clean, focused change with a single, well-documented commit, supporting reliable release planning and traceability. Technologies/skills demonstrated: - API version management, dependency compatibility, and repository maintenance. - Git commit traceability and documentation alignment.

November 2025: LedgerHQ/ledger-secure-sdk focused on stability and device recognition. Delivered a critical bug fix for the Nano Gen5 USB descriptor, correcting the USB product string to ensure proper device identification and reduce onboarding and support friction. No new features were released this month; all work centered on bug fixes and quality improvements. Overall impact: improved hardware compatibility, smoother device onboarding, and stronger release readiness. Skills demonstrated: USB descriptor standards, firmware debugging, Git-based workflows, and cross-team collaboration.

October 2025 monthly summary for LedgerHQ/ledger-secure-sdk. Focused on improving API compatibility visibility and documentation quality. Feature delivered: API Level 25 Compatibility Documentation Update. No major bugs fixed this month. Impact: clearer API support guidance, faster developer onboarding, and improved maintainability of compatibility information. Technologies demonstrated: README/documentation maintenance, version-controlled changelog, and adherence to API compatibility practices.

September 2025 focused on strengthening compatibility, stability, and user experience across LedgerHQ/speculos and LedgerHQ/ledger-secure-sdk. Delivered binary compatibility updates for Apex P API level 25, enabling smoother operation with Apex P 0.0.2-rc2 with no code changes. Improved Apex P stability in Speculos-Ragger automation by adding a pre-refresh delay to resolve a race condition. Introduced device-specific hold-to-approve timing configurations (Apex, Stax, Flex) by removing a global flag and enabling per-device tuning. Enhanced cross-platform error reporting by conditionally including OS-specific error headers based on HAVE_BOLOS, reducing build inconsistencies. Fixed UI stability issues in NBGL: ensured partial refresh after radio button selection and corrected resource loading by wrapping images with PIC(). These changes collectively reduce flaky tests, improve UX consistency across devices, and lower maintenance overhead.

August 2025 performance summary for LedgerHQ/ledger-secure-sdk: Focused on delivering configurable runtime behavior for secure workflows and stabilizing the Over-The-Software-Update (OSU) path. The changes emphasize business value through tunable configuration, reliability, and maintainability across the Apex target and OSU flows.

July 2025 monthly summary focusing on stability and business value delivered through targeted bug fixes in two key repos. No new features released this month; the work centered on enabling reliable functionality and improving testability for upcoming feature cycles.

June 2025 monthly summary for LedgerHQ/ledger-secure-sdk: Focused feature delivery and tooling improvements around image processing and cross-device support. This month emphasized delivering business value through improved image quality, processing efficiency, and broader Apex compatibility while maintaining alignment with Flex and Stax workflows.

April 2025 (2025-04) monthly summary focusing on business value and technical achievements. Delivered expanded device support and build reliability across LedgerHQ/ledger-secure-sdk and LedgerHQ/speculos. Key features delivered include Apex P/M Target Support (Apex P and Apex M) with updated hardware IDs and integration into the build system, and tuned tune-name logging with improved sound setting handling for Stax/Flex devices. Major bugs fixed include correcting Apex P/M target ID values and fixing the app build for Apex P/M, resolving build-target parsing issues. Overall impact: broader device coverage, more robust and reproducible builds, and improved runtime observability with actionable logs for tunes and device settings. Technologies/skills demonstrated: C/C++ development, Makefile-based build tooling (Makefile.defines/Makefile.glyphs/Makefile.target), hardware target integration, seproxyhal logging, tune-ID to name mapping, OS_SETTING_SOUND handling.

March 2025 monthly summary for LedgerHQ/ledger-secure-sdk: Delivered audible feedback and font compatibility improvements, with targeted code quality fixes. Key features and risk-reducing changes implemented to enhance user experience and reliability on legacy display drivers.

January 2025 (2025-01) monthly summary for LedgerHQ/ledger-secure-sdk: Focused on stabilizing app parameter computation when an application icon is not provided. Implemented a Makefile-based fix to conditionally include the application icon parameter, preventing build/install failures and enabling the parameter computation and installation process to proceed in iconless workflows. This change reduces release friction and improves reliability for iconless deployments, with clear traceability to the relevant commit.

Month: 2024-12 — Endorsement API work across LedgerHQ/ledger-secure-sdk and LedgerHQ/speculos focused on backward compatibility, version-aware emulation, and documentation improvements. Business value delivered includes safer migrations for older clients, expanded testable API surface, and stronger QA through version-differentiated emulation. Technologies demonstrated include C system-level API design, retrocompatibility wrappers, header and prototype updates, and meticulous docs.

Monthly work summary for LedgerHQ/ledger-secure-sdk - 2024-11 focusing on delivering features, hardening stability, and aligning documentation with platform versions.

October 2024 monthly summary for LedgerHQ/ledger-secure-sdk. Focus areas: security module refactor and device compatibility. Key outcomes: 1) CERT module syscall cleanup and reorganization (refactor of custom CA elements; removed obsolete syscall; renamed existing syscalls) — commit 9a0ce16e30e1f733e85e353f7c188b3d1b503bbf. 2) Device API Level Expansion for nanos/nanox/stax/flex — added new API levels to improve compatibility with newer devices; commit 3d063da5663e7d4d5a4804bf05e5e83be74aea6d. No major bugs fixed were logged this month. Overall impact: enhances security module maintainability and accelerates support for upcoming devices, reducing maintenance costs and shortening time-to-market for new features. Technologies/skills demonstrated: refactoring, CA module architecture, API level data management, cross-device compatibility, and version-controlled change management.