Its simple, just pick the radio you want, I recommend the .30 from the 2.3 leak. Rename the file pc10img.zip and put it on the root of the sdcard, not in any folders. Boot to the bootloader, by powering down then pressing vol down and power at the same time to boot up. Bootloader will scan the card see the pc10img file and ask if you want to update, press yes. Make sure you have a full battery before doing it. if you power down in the middle of it it can brick your phone, no coming back.