JRC JMR-92 Series Field Service Manual page 770

5. TOPU Firmware updating by using the remote update tool
(1) The maintenance tool is activated.
CAUTION!!
In TOPU firmware update, do NOT use the USB port of TOPU. Otherwise, the TOPU
operation unit is reset during updating, making update impossible.
Use USB Ports of CCU.
(2) Select OperationUpdate.exe and press OK. The remote update tool is activated.
5-27 Section 5 Software Update