This is a supplementary video to my "How to downgrade iPhone Firmware 4.0.2 to earlier version" video. Some people wanted to know how come when the go to restore in iTune the firmware file they downloaded does not work. Most common issue is the file was saved as .zip instead or .ipsw. The video tell you how to change the file extension in Windows.
nice thanks !
DJMIKESTER 1 year ago