# Troubleshooting ## 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 re-connect it * Click the "Scan for Devices" link in the bottom-right corner of the Hardware tab If that doesn't work, follow the steps for the type of device that is missing. ### Control Hubs connected via USB * Make sure that the Control Hub is plugged in via USB-C, not Mini USB * Make sure the Control Hub has had a chance to finish starting up, and that its light is green * Unplug the Control Hub from the computer and plug it back in ### Control Hubs connected via WiFi * Make sure that the Control Hub is running version 5.5 or later of the Robot Controller app * Make sure the Control Hub has had a chance to finish starting up, and that its light is green * Make sure that you are currently connected to the Control Hub's WiFi network * Try rebooting the Control Hub. Re-connect to its WiFi network after its light turns green * Plug the Control Hub in via USB instead ### Expansion Hubs connected to a Control Hub * Make sure that the Expansion Hub is in the active configuration file * Make sure that the Control Hub is running version 5.5 or later of the Robot Controller app ### Android phones * Make sure that USB debugging is enabled in the Developer Options * If you can't find Developer Options anywhere in the Settings app (it may be listed on a System screen or similar), make sure it is enabled by tapping on the Build number 7 times on the About screen of the Settings app. * Unplug the phone from the computer and plug it back in. Look for a prompt to allow USB debugging, and click OK when it comes up. * Make sure that the ADB driver for your Android phone is installed. For Motorola phones, do this by installing Motorola Device Manager. ### 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 --- # Agent Instructions: 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: ``` GET https://docs.revrobotics.com/rev-hardware-client/gs/troubleshooting.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.