mac leopardo itune 7.5 iphone unlock hi , after I upgraded from 1.1.4 to 2.0, I decided to downgraded to 1.1.4 again after uninstall itunes 7.7 and install 7.5 and solve the problem 20 ,I got the 1604 problem . I tried in a different usb port and I got the 1604 error again. the big problem is that my iphone is in recovery mode. even If i turned off the iphone or I hold home + sleep bottom or whatever I still get the same in my screen . the itune icon with usb icon! with no slide bar for emergency call. I cant go back to the screen that says that I have and invalid sim card . can anyone help me?