Update v3.md

pages/v3.md

@@ -40,9 +40,13 @@ To use Pi-KVM v3, you will need the following things, which are NOT included in
    
 # Installation
 1. [Build the device](https://www.youtube.com/watch?v=-SRL92VJ870).
-2. [Install the operating system](flashing_os.md) (choose the v3 image).
-3. Power it up
-4. If your kit includes the display and/or the fan, you'll need to turn them on after installation:
+1. Build the device:
+    * [Device with or without the 3D-printed case](https://www.youtube.com/watch?v=-SRL92VJ870)
+    * [With the metal case](https://www.youtube.com/watch?v=jdqiwHKQcD4) (+ [AUM option](https://youtu.be/GGMufHuqyp0))
+
+3. [Install the operating system](flashing_os.md) (choose the v3 image).
+4. Power it up
+5. If your kit includes the display and/or the fan, you'll need to turn them on after installation:
    ```bash
    rw
    systemctl enable --now kvmd-oled # For the display