First byte 0xB6 is OK. Then you should put the VID, DID and PID. Check the EZ-USB FX TechRefManual.pdf on page 5-9. The code info begins at offset 9 starting with address (2 bytes), length (2 bytes) and data block (your code).

If the USB core detect connected eeprom and first byte at address 0x0000 has a value of 0xB6, it loads the data block into into EZ USB FX ram and starts it.

I just don't understand what do you need it for. EZUSB FX is powered from the USB port and when connected to PC, can also download your hex code.

Franc