Ricoh D146 Service Manual page 1758

System Maintenance
4. Select "update.sig.zip", and press the [HOME] key.
5. The installation screen is displayed.
6. The current version of the firmware, and the update version of the firmware in the SD
card are displayed. Check that the version is correct.
7. When "Continue Update?" is displayed, press OK ([HOME] key).
8. Version Update is started.
SM 21 D148