Update mainboard.md

Author: 1coderookie

docs/hardware/mainboard.md

@@ -30,7 +30,11 @@ The mainboard comes with TMC2208 silent stepper drivers *soldered* onto the boar
     Thanks again to @aspiringnobody who came across this and reported it!  
 -->  
 
-![Mainboard TriGorilla front](../assets/images/mobo_K2_full_web.jpeg)  
+![Mainboard TriGorilla front assembled](../assets/images/mobo_K2_full_web.jpeg)  
+
+![Mainboard TriGorilla front](../assets/images/Trigorilla_Pro_B_v102_front_web.jpg)  
+
+![Mainboard TriGorilla back](../assets/images/Trigorilla_Pro_B_v102_back_web.jpg)  
 
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 ![Mainboard TriGorilla back](../assets/images/mainboard_K2Neo_back_web.jpg)