Once the USB Key is prepared (see How to create Recovery USB Key for ThinOX or How to create Recovery USB Key for Windows Embedded or How to create an Upgrade BIOS USB Key for Praim thin client) you can use it on a thin client.
Follow the instructions below to boot from USB Key on H-Series Models(H9154, H9114, H9119):
Insert the USB Key in a USB Port on the thin client.
Power on the thin client and press the ESC key to access the Boot Menu.
From the Boot Menu select (using arrow keys) the USB Key and then press <ENTER>.
How to select the USB Key from "Boot Menu"
For most BIOS the USB key is available and can be selected under HARDDISK, press <ENTER> on the keyboard and selected then USB0 (or similar, it can be also the model name of the USB key).In some cases (depending on the BIOS version and manufacturer) select USB-ZIP from the available choice.
The restore procedure will start immediately and the progress status is shown on the monitor. DO NOT turn off the thin client during this phase. At the end of the process a message will indicate Now remove your USB device.
Remove the USB Key from the thin client and it will reboot.
The thin client will eventually ask for Numero di Serie (Serial Number) and Codice Licenza (License Code).
Missing license code
For more information, read Where can I find a device's license code?