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A new usb drive won‘t help because of DSM‘s system partitions on each hdd which contain the „new“ system. There are several methods to get back in business. 1st) Boot a live linux, mount the raid and try to modify the text file which contains the version info (you‘ll have to search the forum for the exact name and path). 2nd) Disconnect all hdds, connect a new one, install the older version of DSM on it, shut down the system, reconnect the old drives and start it again. DSM should recognize the old RAID. 3rd) Hardcore method: delete each system partition (first partition) and reinstall DSM after that. Normally DSM should recognize the RAID array after the initial setup but with no warranty. In case of 2 & 3 all your settings will be lost.