Add a factory reset page at the request of the support team (#41)

Author: civerachb-cpr

troubleshooting/factory_reset.md

@@ -0,0 +1,45 @@
+---
+sort: 4
+---
+
+# Factory Reset
+
+Performing a full reset of your TurtleBot 4 is a two-step process:
+1. the Create® 3 must be reset, and
+2. the Raspberry Pi's SD card must be reset.
+
+## Resetting the Create® 3
+
+To reset the Create® 3 to factory settings, [first open the Create® 3 webserver](../setup/basic.md#accessing-the-create-3-webserver).
+Click on the `About` tab in the upper right corner.
+
+<figure class="aligncenter">
+    <img src="media/about_button.png" alt="About tab" style="width: 70%;"/>
+    <figcaption>Click on the About tab in the upper right corner</figcaption>
+</figure>
+
+```note
+If you are unable to access the Create® 3 webserver on port `8080` of the TurtleBot 4's Raspberry Pi you may need to put your Create® 3 into Access Point mode and connect to it directly. Press and hold buttons 1 and 2 on the Create® 3 until the light ring shows a spinning blue light.
+
+Once the Create® 3 is in Access Point mode, connect your laptop to the Create® 3's wifi network and navigate to http://192.168.10.1 to access the Create® 3 web server.
+```
+
+Scroll to the very bottom of the `About` screen. There you will find a hyperlink marked `Factory Reset`. Click this hyperlink to perform a factory reset of the Create® 3.
+
+<figure class="aligncenter">
+    <img src="media/factory_reset.png" alt="Factory reset link" style="width: 70%;"/>
+    <figcaption>Click on the Factory Reset link to reset the Create® 3</figcaption>
+</figure>
+
+The Create® 3 factory reset link will reset all user configurations, but will not reinstall the firmware. ROS namespaces,
+domain IDs, custom safety parameters, and any custom networking configurations will all be deleted.
+
+## Resetting the Raspberry Pi
+
+To reset the Raspberry Pi, [reinstall the SD card image](../setup/basic.md#install-latest-raspberry-pi-image).
+This will permanently delete all information on the SD card; make sure you have any essential data backed up.
+
+## After reset
+
+After you have reset your TurtleBot 4, proceed to [connect it to wifi](../setup/basic.md#connect-the-raspberry-pi-to-your-network) and
+[pair the controller](../setup/basic.md#turtlebot-4-controller-manual-setup).