After you've put the phone itmohe DFU mode, try connecting it to iTunes. You should get a prompt saying that iTunes had detected a device that needs restoring/updating (I forget the actual words).
After you accept that prompt, you should get an iTunes screen that has a "Restore" button. Press the button and iTunes should then install the proper iOS.
Marilyn
After you accept that prompt, you should get an iTunes screen that has a "Restore" button. Press the button and iTunes should then install the proper iOS.
Marilyn