[TGHI]

If I remember correctly, your SD card that you are using must be formatted FAT32. The VOGUIMG.nbh file must be in the root of the SD card, as well - personally my card was completely empty. Also, it does not seem to work when using an SDHC card (> 2GB), so use the 512MB one that came with the phone if possible.

To get the radio to flash over, put the phone in bootloader mode by holding down the camera and power buttons and pressing the reset button. You should see the 3 coloured bars and 2.31 CoKe (since you said that it is unlocked). Your screen should then flash to a progress bar as it loads the new radio.

If I remember correctly, it will hard reset your phone.

Have fun.