Re Imaging Dell Wyse 5010 Thin Client

I am trying to re image some Dell Wyse 5010 Thin Clients,

I can see they have a sticker on them saying

windows embedded

Standard 7 (WS7E)

When i try to load the Thin OS software i get Error 233

I can see the key in the XML file, but how do i find the security key on the Thin client, that only has the Bios on it?

Is there a standard key for the 5010 series thin clients?

I did see in another thread, that you cannot load a thin OS onto a windows embedded device.

Is this true?  If so Why?  Its just re flashing the drive, if it is locked like that, that seems a strange thing to do.

Any help would be appreciated, if i cant re flash them i will have to send them back.

Thank you