error 1015 in iPhone 3G/3gs model no a1241

hi iv got iphone 3g/3gs model no a1241 I tried to reset to its factory settings I went settings general and I pressed erase all contents and settings while it was in setup its stucks in apple logo and iTunes logo i tried to fix it in iTunes but its giving me error 1015 after doing the setup pls i really need help tnx...