Hi, I've got Robo3D R1 bought a few years ago. I would like to upgrade Marlin to 1.1.9 version, because it has new way of step stick configuration. That's why I need to know what step sticks were being mounted into Robo3D R1. Here the photo of hardware I've got inside. It looks like a custom made white Arduino especially for Robo. Do you know what kind of stepsticks are these? Thanks.