How do you reset a Wyse S90 terminal to factory setting?

To reset a Wyse S90 terminal to factory settings, power on the device and, during the boot process, press the "Ctrl" and "Shift" keys simultaneously, followed by the "R" key. This should bring up the reset menu. From there, select the option to reset to factory settings and confirm your choice. After the process is complete, the terminal will reboot with default settings restored.