ds3617xs, I can shutdown and reboot.
kernel parameters:syno_hdd_powerup_seq=1 HddHotplug=0 syno_hw_version=DS918+ vender_format_version=2 console=ttyS0,115200n8 withefi elevator=elevator quiet syno_hdd_detect=0 syno_port_thaw=1
CPU J1900 / Main custom from china (i don't know name)/ Ram 4gb ddr3 buss 1600 Mhz