RN10400 (no replies)

Hello,

i have a old Netgear readynas model name RN10400 model no RND-4D. Well okay, This nas i have a problem with because it not start up. it is 4x3Tb HD. disks. And every disk start up and runing well. But i can't get enything out of it.
And in the display is standing. "Boot from USB failure....."

I don't know what ReadyNas os ver. firmware is installed. But i have read from netgear support that shall be first updated to ReadyNas Os 6.2.5 or 6.3.5 then upgard to ReadyNas os 6.5.2 and to 6.10.X or else it go broken.

And the netgear say this product/software is end of life.

So is there enyone who can help me with this.? And help me make a USB so i can upgard my Nas and get it up and going again.
Netgear not support enything, Not sell new motherboard nothing. I saw on internet a shop in England who had new motherboard to my RN10400 but they was out of stock. Mayby not so strange when they go broken very fast.

Well can somebody help me with this. I hope so.

Thanks..