Missing Shares after rebooting

My 3 media shares are missing after rebooting my readynas.

I'm a month and 6 days out of the 90 day support (bought June 14th 2016).

Server has been acting up since I upgraded to firmware 6.6.0

Manufacturer Part No:     RN204-100AJS

The space is still showing as used (3tb free of 5.4tb)

The home user folder is still visable and full of original data.

I've tried adding a share with the same name but the data didn't reappear.

Tried rebooting since but no change and of course I dsidn't save the damn config file..

I've looked online and see some posts regarding SSH but no clear guides to do this, I can turn on ssh but not sure how to interface with it.

Can anyone give me a guide what I'd need to install on a host machine (putty???) and what commands I'd need to navigate around and copy the data to new shares or recover the old ones?

Thanks

Peter