EDIT: parition1: set common_args_3617='syno_hdd_powerup_seq=0 HddHotplug=1 syno_hw_version=RS4017xs+ vender_format_version=2 console=ttyS0,115200n8 withefi elevator=elevator quiet syno_port_thaw=1'     parition2: copy grub_cksum.syno , checksum.syno to the second partition where zImage and rd.gz files are.    and once it boots, install the same RS4017xs+  DSM pat file.