Canon imageCLASS LBP325dn Service Manual page 202

7. Insert the USB flash drive to USB port of the host machine's rear side.
8. Turn ON the power while pressing down the "<- " , "OK" and "Online" simultaneously.
9. Press the left arrow key or the right arrow key on the Control Panel until the "LOG TO USBMEM" menu is displayed.
BOOTROM XX.XX →/↓
UPDATE:LANC →/↓
UPDATE:USB →/↓
LOG TO USBMEM →/↓
DL-T DATA WRITE
Do not turn the main
power OFF.
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7. Troubleshooting