Not hard largely irrelivant from a Windows POV, and lets remember that RT is just a port of normal Win8 with all the bits yuo really wanted, removed...
Nokia N920, Surface Pro2 256Gb
*ALL* Surface RT WinRT 8.0 Recovery Files on UK FTP - Surface RT WinRT 8.1 Euro
Surface 2 8.1 Euro
Surface Pro Win 8.0 Euro
Surface Pro 2 Win8.1 Euro
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