No
The iPhone 4 can only support from iOS 4.0 to iOS 7.1.2. There is no way to get any higher iOS Firmware due to the older hardware that is built into the iPhone 4.
The ios 8 should work on the iPhone 4 now. If you cannot get it to work you should call the company and tell them what is going on. This is incorrect ios 8 will not work on the iphone 4
iOS 8 is customizable by users with programming skills check out - codenameone.com/blog/ios-8-installs-customizing-the-pull-to-refresh
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.
iOS 4 is the name of the iPad operating system (iOS) and the version (4)
ios 8 can be installed on ipad by first registering or have your device UDID registered by a developer and then download the iOS 8 beta and install it on your ipad
Jail breaking a IOS 8 phone is hard to do. You will have to reset the phone all the way.
8/4 = 2 There are two 4s in 8.
iOS 8 should not affect your phone at all. It should be safe.
Depends on what iOS your trying to jailbreak. iOS 8: Pangu iOS 7: Pangu and Evasi0n iOS 6: Evasi0n and Redsn0w iOS 5: Absinthe 2.0 iOS 4 and below: On your device, go to Jailbreakme.com and just install there. Note: MAKE SURE the jailbreaks are Untethered. Which means you dont need a computer to boot your phone up again.
Yes, when iOS 6 comes out it will be free of charge, just like iOS 5 and iOS 4 were.
Yes, you can run iOS 7 on the iPhone 4.