130+ Ender 3 V2 Bltouch Pinout Uitstekend . The bltouch upgrade is going to work with both the 4.2.2 or 4.2.7 mainboard that you might also find in the ender 3 v2, it's just going to be a minor difference in the firmware selection, you'll see that later. If you are using a different extension wire, please pay attention to the wire colors above. Our unified 2 firmware is setup to use the 3+2 wiring pinout by default but there is also an option called. In this guide, we're installing the bltouch bed leveling probe on the ender 3 v2.