Like Fly wrote, extract the boot.img from the cm9.zip, then zip the boot.img and name it PH98IMG. Place the PH98IMG.zip file on your SD card. Flash the ROM, then go into the bootloader and run fastboot.
Or, download CounterShrike, that's the only ROM that worked for me and S-on. You still have to go into the bootloader, but this ROM's installer places the file for you.