IF the red and yellow stays on the processor never start the main program. Reset the box to Factory default by pressing the Reset button for 30 sec. Connect a serial cable to COM1. Start a terminal program in the PC set to 38400 baud, 8 bit, 1 stopbit, no parity, no handshake. If the bootloader in the box sends some text to the terminal it's possible to upload a new firmware via X-modem. If no text shows you better send the PCB to us.
73 de mike