I jailbreaked my 3Gs 05.12.1 bootrom ios 3.1.3 firmware this summer with spirit. And I accidently upgraded my iphone to 4.2 software. And I tried to jailbreak it with redsnow, and get stuck in apple logo screen after the pineapple screen appeared. Please help me, I tried to downgrade and rejailbreaked my phone over again with redsnow and limera1n but there is no luck. Please help me.