So, little update from my side. The micro-JST 1.25mm connector does NOT fit. At least the one I bought from eBay. I bought a MOLEX 51021- 0300 3 PIN (some have more or less Pins) from eBay + cables that fit in there and well it works For testing I just put the 3 cables into the 3Pin adapter from the FAN and it worked on the go. And as I am to lazy to solder, I just wrapped some tape around it. Also the same with the FAN itself around the wooden plate I put on the Udoo. Picture1: you see the micro-JST 1.25mm compared to the MOLEX 51021- 0300. Pic2: micro-JST cable compared to the MOLEX 51021- 0300 + 3 cables (MOLEX - 06-66-0016) Pic3: The 3 pre-crimped ends to fit in the adapter. Pic4: The other end of the cable to solder at other cables or you could use for FAN-connection: MOLEx - 22-27-2031 (I dont have it) Pic5: The completed cable in the Udoo. I also marked the PIN-order. For reference goto page 33 at the bottom: http://download.udoo.org/files/UDOO_X86/Doc/UDOO_X86_MANUAL.pdf Pic6: My completed setup with the external-power button (I dont need SATA. Have M2-SSD and will use USB3.0 external). PS.: Sorry for bad macro-photos. Sony Z5c is really bad at it, at least mine..