Instructions to connect MangoPi MQ-Quad (Allwinner H616) to Klipper serial UART Edit orangepiEnv.txt and add overlays=uart5: sudo nano /boot/orangepiEnv.txt In Klipper printer.cfg: [mcu] serial: /dev/ttyS5 restart_method: command Connect printer board RX-TX to MangoPi TX-RX accordingly: Enjoy.