Hi, After working on EZUSB FX evaluation board,I am now working on our own EZUSB FX2 board. Right now the main task is communication to Hardware through MON51 utility.In my custom made FX2 board,Memory mapping and other configurations are same as EZUSB-FX evaluation board with little changes. For communicating to MON51 ,I am using "mon-ext-sio1-c0.hex" file which I am downloading on EEPROM. On Keil Debugger I am starting Code Space from 0x4000 and xdata from 0x5000. The baudrate is 38400 and port is COM1 as I have only one serial port. But still I am not able to communicate to my FX2 board. Please let me know what else I have to do to make communication. DO I have to change Install.A51 file?If yes then what values I have to change.Please let me know. I gave a try after running command "Install 8 7f 0" on command prompt to create MON hex file. And I downlaoded this file to EEPROM using EZ USB COntrol panel, but I am not getting success!! Please help me with this!!