For example, insert the USB flash drive that contains the OS distribution files into the external USB port located on the back panel of the server.
For more details, refer to:
Location of the server's external USB port – Server Components in Oracle Servers X8-2 and X8-2L Installation Guide
Attaching local devices to the server – Attach Devices to the Server in Oracle Server X8-2L Service Manual
Location of server cables – Server Features and Components in Oracle Servers X8-2 and X8-2L Installation Guide