Upgrading Netgear ReadyNAS Pro 6 from RAIDiator 4.X to ReadyNAS OS 6.X
Legacy Netgear ReadyNAS models do not officially support the new ReadyNAS OS 6. Luckily is pretty straightforward to upgrade most of X86 based legacy ReadyNAS devices from RAIDiator 4.2 to ReadyNAS OS 6 unofficially. Needless to say, this is completely unsupported by Netgear and proceed at your own risk.
There are bunch of threads about this on Netgear Forums, but basic instructions can be found here.