> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/s2gw-installation-manual/advanced_use/s2gw_application_upgrade.md). # S2GW app upgrade If a new S2GW application will be released the gateway shall be upgraded. It is highly recommended to always upgrade S2GW app before the S2GW installation or during its maintenance. The upgrade is done by writing all files of the updated version into the /boot/ICU directory of the SD card. When you have access to the unit you can do the update by writing the files onto its SD card. When you have remote access you can do it using WinSCP and Putty. Both methods are described in the following chapters. The latest version of S2GW app is stored in Technical File at . --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://help.boomerang3.com/s2gw-installation-manual/advanced_use/s2gw_application_upgrade.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.