You could try the process in this post   Another option could be to use the 'clean drive' install process provided you have a spare HDD and SATA controller port; 1) Disconnect your raid drives 2) Connect spare HDD to SATA port 1 3) Install DSM 6.x, create admin user and server name matching live system, DONT create volume/raid 4) Shutdown, reconnect raid drives to SATA ports 2-n 5) Boot, login, repair system partitions on raid, shutdown 6) Remove spare HD
    • Thanks
    1