> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/rev-hardware-client-2/rhc2/troubleshooting.md). # Troubleshooting {% hint style="warning" %} Please note that you cannot update the original Hardware Client to Hardware Client 2. You must install Hardware Client 2 separately, as they are completely different applications. While they can be installed simultaneously, it is not recommended to have both open at the same time. {% endhint %} ## Device is not visible If you don't see all of the devices that you expect to see, follow these steps: * Make sure that you are connected to the Internet, so that Windows can download the necessary drivers * Disconnect the device from the computer and then reconnect it ### Mac Users and Recovery Mode If you plan on using RHC2 on a macOS machine, please note that recovery mode devices will only show up on mac if the app is copied into /Applications. ### SPARK MAX Motor Controller * Make sure that the SPARK MAX is not being used by another application, such as the REV SPARK MAX Client * Unplug the SPARK MAX from the computer and plug it back in ## Firmware Compatibility To use your device with RHC2, you must have 2026 firmware (v26.x.x). Devices with 2025 firmware or lower must be updated to 2026 via [recovery mode](https://docs.revrobotics.com/rev-hardware-client/ion/recovery-mode). SPARKs can be updated via CAN with RHC2 if the bridge device (the device connected to USB) is updated to firmware 2026. --- # 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 dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.revrobotics.com/rev-hardware-client-2/rhc2/troubleshooting.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.