I recently purchase my iPhone4 and jailbreaked it with RedSnow. It appears that my camera flash light is faulty now as it wont turn on when i use my camera or any flashlight apps. I believe it's a software fault as i did not drop my phone and have been very gentle with it. I have tried to reset the settings but the flash light still does not work. I need to restore my phone back to factory state so that i can send it back for a warranty exchange. However when i tried to restore with the iTunes, after verification with apple,error code " Your iPhone could not be restored, this device isn't eligible for the requested build 4.2.1 " Would appreciate if i receive help and tips on this issue. Thanks !