Hi Hossam,
Yes you have to tell it which port and what rate, etc. Are you using the loader that came on the LPC? I think it is at 9600. You also have to enter your crystal frequency into the flash loader.
Hope this is of some help.
Regards,
Robert
Thanks for your help the problem was the serial cable.
The Flash utilitu don't need to be telled the baud rate as the bootloader detects it .
if the LPC crytal is 12000 then 9600 is a good rate
the the LPC crytal is 14xxx wich is common multiple of bude rates then you could program at any supported rate