JRC JMR-92 Series Field Service Manual page 753

5.3.1 Starting the OS on the D Drive to Start This
Equipment
Start the OS on the D drive to start this equipment according to the following procedure.
1.
Enter the power to this equipment while simultaneously holding down the [SILENCE] key
and [ZOOM OUT] keys.
When startup is completed, the following message is displayed.
The recovery SSD tool can be executed in this state.
Section 5 Software Update 5-10