The proper way to move synoboot to a much higher enumeration is to change DiskIdxMap in grub.cfg   On jun's 1.03b, the default is DiskIdxMap=0C 0C = Disk 13   Change it to something much higher DiskIdxMap=1F 1F = Disk 32   For more info: https://github.com/evolver56k/xpenology/blob/master/synoconfigs/Kconfig.devices#L245