Add section for checking if Unlaunch is installed

docs/get-started.md

@@ -41,7 +41,16 @@ Unsure what the SD "root" is? [See this image](/assets/images/sdroot/en_US.png)
 :::
 
 
-## Section II - Selecting an exploit
+## Section II - Checking if Unlaunch is already installed
+
+Some DSi consoles that are sold as used/refurbished might already have Unlaunch installed.
+
+To check, press the `POWER` button and immediately hold the `A`+`B` buttons.
+	- If you see a menu which shows `Nocash Unlaunch.dsi` on the top screen, this means Unlaunch is already installed, and you can continue with [dumping the NAND](dumping-nand.html).
+	- If the DSi starts normally with the DSi Menu appearing, proceed with Section III.
+
+
+## Section III - Selecting an exploit
 
 From here you have three options, with a minor difference in what each entails.