I've used the 'clean drive' method to downgrade in these situations'   1) Disconnect your raid drives 2) Connect spare HDD to SATA port 1 3) Install DSM 6.x from fresh 1.02b loader, create admin user and server name matching live system, DONT create volume/raid. Update DSM to match your pre-beta version 4) Shutdown, reconnect raid drives to SATA ports 2-n 5) Boot, login, repair system partitions on raid, shutdown 6) Remove spare HDD and reconnect raid drives to
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