> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/adk-os-platform/readme/change-history.md).

# User Guide Change History

Documentation changes to this guide, most recent first. For VOS3/ADK software release notes, see [ADK Release Notes](https://docs.verifone.com/adk-release-notes/).

| **Date**       | **Description**                                                                                                                                                                                                                                                                                                   |
| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| August 5, 2026 | <ul><li>Migrated the UX3/4/1 user guide page into GitBook</li><li>Fixed hidden and duplicated table headers in the packaging and FOD docs</li><li>Added column headers to the ADK library and compiler flag tables</li><li>Removed non-existent util.h/libutil from the VOS3 ADK SYS SDK list</li></ul>           |
| July 1, 2026   | <ul><li>Added the full VOS3 User Guide, including new pages for managing CP applications, device connectivity and card interfaces, and diagnosing and troubleshooting. Expanded the security functions and key management, packaging and installation, and user interface and application control pages</li></ul> |


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