have you even tried running the RUU program?
Download: RUU_Hero_C_Sprint_1.56.651.2 signed release.exe Geek For Me – Android CDMA Sprint Hero it "should" put the phone back to new out of the box condition.. if not, then yeah it's bricked and take it to Sprint and tell them it just died.. in the future, make 100% sure that the ROM is for the CDMA hero.. not the GSM hero