Bought iPhone 3G but stuck in recovery mode
I just recently bought an iPhone 3g. Got it for $20. However it is stuck in recovery mode. I'm not sure if it has ever been jailbroken. It has iPhone1,2_4.2.1_8C14_8_Restore.ipsw in the folder. I tried to restore it but get the error 1015. I created a new ipsw iPhone1,2_3.1.3_7E18_Restore.ipsw but when holding alt + shift in itunes to select it, i get the error message "The software required for this iPhone is not installed correctly. Please reinstall iTunes to install the required software."
I can't seem to get passed this. Does anyone have any ideas? I have done a ton of research. Not sure what baseband it's on. Help PLEASE!!