There is an upgrade socket on the back panel. How is this socket used, and which kind of cable must I buy to use it?

There is an upgrade socket on the back panel. How is this socket used, and which kind of cable must I buy to use it?

Although the owner's manual states that owner can use this connector for home upgrade procedure, this is not so. The USB-connector used cannot be bought in commercially available cables, and the port must be considered for technician's use only.
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