Oki IP-6620 Maintenance Manual page 315

5.7 Updating the Firmware
5.7.1 Create an USB drive for updating the firmware
Create an USB drive for update by writing the system file on it.
<Procedure>
(1) Create a folder with the name CPL on the USB drive root directory.
(2) Create a subfolder with the name sys in the CPL folder.
(3) Copy the system image file system.img in the sys folder.
<File tree in the USB drive>
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OKI Data Infotech Corporation CONFIDENTIAL
Chapter 5 Troubleshooting (Engine Section and USB Controller Section)