I reverted to stock Sprint ROM on my Optimus S to swap phone numbers with my new phone. Well, everything works except the 1xRTT/3G radio. Wifi and Cellular radios still work though. I flashed three times in total. Once to revert to stock, then again to make sure it took. The third time was because someone said I should in Kraven's CM7.1 thread. Still don't work though.