Updated End user guide (markdown)

End-user-guide.md

@@ -7,14 +7,21 @@ This is work in progress and also never finished, as new functionality and also
 ## Steps
 * Setting up Wifi
 * Using the WLED app
-* Configuring a Led strip
 * Create your first effect
 * Saving effects using presets
 * Using sliders
 * Changing colors and palettes
 * Multiple segments
+* Updating WLED
 * ...
 * Trouble shooting
 
 ## Setting up Wifi
 * See [Home](https://github.com/Aircoookie/WLED/wiki), step 3, 4 and 5
+
+## Troubleshooting
+### All WLED settings gone
+For instance due to crash, factory reset or update
+1. See Setting up Wifi
+1. Change server description in Settings / User Interface
+1. Configuring a Led strip