How to Fix the iPhone's Dreaded Recovery Loop and Downgrade Back to iOS 4.3.3
Apple iPhone 4S - Reset device - AT&T
How to factory reset a locked iPhone 4 without iTunes - Quora
Fix an “Activation Error” After an iPhone Reset / Restore | OSXDaily
How to factory reset iPhone 4 without passcode and iTunes? - TheNewPerfect.com
Hard Reset for Apple iPhone 4s
Si vous avez oublié le code d'accès de votre iPhone - Assistance Apple (FR)
4 manières de réinitialiser un iPhone - wikiHow
Unlock Your iPhone 4/4s: Factory Reset Without Passcode or iTunes - Rene.E Laboratory
How to Force Restart an iPhone 4 - iFixit Repair Guide
How To Connect Any iPhone(4/4s/5/5s.....) To PC Via iTunes Latest Working - YouTube
discussion] I might have corrupted this iPhone 4 every time I try and reset it with the iOS 7 ipsw even with the iTunes downloaded version it just shows the iTunes screen :
Comment mettre iPhone 4S en mode DFU ? - HardReset.info