help me know the operating system image for Dell Wyse R90LW

I am the owner of a Dell Wyse R90LW thin client and would like to restore it to its factory state.
Unfortunately, the original operating system has been removed, and without the correct Windows XP Embedded or Windows 7 if it existed for it image, the device cannot be fully used.

Here are my device details:

Model: Dell Wyse R90LW

SERIAL NO: 24HDIC00195

Part NO: 909543-21L

SUB-ASSY P/N: 849212-11L