I had the same problem. I did some reading and found out you dont flash the radio through recovery. You need to get into hboot. To do this shut the phone off hold the volume down first and while you are holding that hit the power on button. Do not let go of the volume key till you get into hboot. From there hboot will scan your sd card for the file. Once it finds the file it will ask you push volume up for yes or volume down for no.
Push volume up let it do its thing. Then it will say push the power button to reboot. When you push the power button it will reboot. Thats all there is to it.