Ricoh D146 Service Manual page 1637

RFU Updating the Firmware
2. Download the same firmware as the firmware supplied to the SD card by RFU, and perform
upgrade with the SD card
(It may take about 5 minutes until upgrade by the SD card starts).
1. Replace the firmware storage destination board.
[Example]
In the case of System/Document: Controller board
In the case of Engine: Engine board
D146/D147/D148/D149/D150 10-2 System Maintenance Section