A radio update is flashed the same way that an update.zip is flashed, however the process goes a little different once you start it. I made a little walk through for everyone out there so that they feel more comfortable doing it. These screen shots are while using RA 1.6.2… in blue. :-)

These instructions were made on the HTC Hero but works the same on other phones.

1) Copy the radio.zip to the root of your sdcard, however you please.

2) Boot in to RA and pick “Flash zip from sdcard”

3. Pick your zip off the list and then hit the button to tell it to flash.

4. When it finishes running it will tell you to restart your phone. Just pick “restart” off the top of the menu.

5. After you click reboot it will say “writing radio image”. Your phone will then reboot to a picture of a phone coming out of a box. It will stay there for about 30 seconds, just leave it. Your phone will then reboot again and it will load in to RA.

6. After it boots in to RA it will say “formatting cache…” and will show a status bar for a few seconds. The phone is done as soon as the status bar goes away. Just click reboot and you’re done.

7. After your phone boots up, check Menu < Settings < About Phone < Software Information < Baseband Version to confirm it flashed. The stock version for our phones is 1.04.01.09.21.