Chosen Solution

I’ve an iPhone 4 and I would restore it with his original iOS (iOS 4.0). Also if I reset iPhone, it goes back with iOS 7.1.2 and I wont it (also because it’s slow on an iPhone 4). So, I ask if is possible restore this device with his original iOS (iOS 4.0). How can I do? Thank you in advance for reply.

It’s not possible to restore your iPhone to iOS 4 because Apple no longer is signing that OS. Sorry bud.