There is no need to use the UPB. Set the H8 pins to put it into boot mode - see the hardware manual - and the connect it to a PC serial port via an RS232 converter. Then use the free Renesas FDT (Flash Development Toolkit) available from their website to program the device.
Evaluation Kit Support
Renesas Evaluation Boards are intended for evaluation of Renesas microprocessors only, not as development tools.