surface rt 32gb wont start windows. Recovery wont work.

I have a 32 gb surface rt.
When i start it "surface" is shown on the screen for 5 seconds and the tablet shuts down.
I downloaded recovery files from microsoft, copied to fat 32 usb.
if i press volume down and power, it boot up and goes into recovery.
When i tried to recover the tablet says "missing partition" or "drive is locked"
if i start command prompt i can see my usb as c: And the tablet´s memory is shown as x:
If i run diskpart and type "list volume" the only drive shown is my usb drive.
Somehow the build in drive is not readable and not shown.
And i think that is the issue windows can´t boot because the drive is missing.
I tried to copy files from usb to built in drive and that is possible.

is drive letter x: the right letter for the built in drive?
it might has to be c: as on a pc.
If any one has a suggestion what to do.
I has been searching for a tool that could repartition the built in drive and after that i wanted to do a clean install from the usb recovery. but i haven´t found anything.

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