HP Spectre x2 - Manual (Page 59)

3. In the text box, enter the product name, and then click Go.
– or –
Click Find Now to let HP automatically detect your product.
4. Select your computer, and then select your operating system.
5. In the Diagnostic section, follow the on-screen instructions to select and download the UEFI version
you want.
Downloading HP PC Hardware Diagnostics (UEFI) to a USB device 51