Restoring a backup merely restores the apps, data, and contacts you had saved on the device. It won't downgrade it from iOS 8 to iOS 7.1.1.
You have to find an old backup of your iPhone and restore your phone from it. It will depend where you have stored your backups either on your computer or via the Cloud. If you only want to downgrade because of the camera, it just takes a little getting used to is all.
Sadly one you update to the latest iOS version, there is not way to downgrade or restore to an earlier version without using intricate hacks.
Sadly, you cannot downgrade an iOS device without installing illegal hacks.
You can't downgrade an IOS on your iPod Touch.
You can't downgrade IOS!
You can use MobiKin Doctor for iOS to restore your iPhone from backup easily. Just launch the program, connect your iPhone, choose “Recover from iTunes Backup File,” select the backup you need, and start the scan. Then preview and restore the data you want—no need to reset your device.
You cannot downgrade an iOS device without installing illegal hacks.
To downgrade iOS 10 to iOS 9, you could use related professional tools such as TunesKit iOS System Recovery, which supports downgrading any iOS versions. Besides, if you have any other ioS issues, this mighty software can help you to get out of trouble.
use your noodle!
You cannot downgrade an iOS device without installing illegal hacks.
There is no way to downgrade from iOS 7 without disobeying the Terms.
Sadly, you cannot downgrade to an older iOS version after updating unless you disobey Apple's terms and use illegal hacks.