So get your new iphone.
when u get it, it will still have version 1.0.1 .
plug iphone into iTunes in recovery format.
hold options and click restore(for mac) and choose the 1.0.2 firmware file. BTW DONT DOWNLOAD THE FILE FROM SAFARI OR ELSE IT WONT HAVE THE ".ipsw" . Download using firefox or something. you must have the ".ipsw" or else it wont work.