I did the above setting and compiled my RTX51 Tiny program for C8051F340 Development Kit successfully. But when I try to select the .hex file for flashing to the board, it gives me the following error. I used the "Conf_tny.A51" file as configuration file. Other programs can be easily flashed using this "USB_BL_APP_F34x_64k_STARTUP.A51" boot loader, but not for RTX51. Does anyone know the solution for this?