Canon LBP351 Series Service Manual page 158

7. Insert the USB flash drive into the host machine.
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