Netgear stora upgrade steps? (no replies)

So I dug out the old Netgear stora is was given years ago and was wondering about giving it a new lease of life. As it stands it is all stock.

What are the best steps to upgrade the device to a better unoot and Debian install?

And once done what sort of performance can I expect? I'm looking to run either JBOD or Raid 0 with two 1tb WD green drives. I'm thinking of using it for my pi cluster, ideally as the network file store and if possible for pxe boot for the os for the 4 pi's. But pxe will depend on the network performance.

Many thanks.