iOS 7 released. Do you want downgrade iOS 7 Beta to iOS 6.1.2? Sorry. No. You can't downgrade iOS 7 to 6.1.2. Jailbreakers: Do not upgrade to iOS 7 until a jailbreak is released. You will lose all your jailbreak! You can't downgrade 7 to 6.1.2.
Apple released new iOS 7 Beta with new features. Official iOS 7 Final Release Date not confirmed. If you are jailbroken on iOS 6 definitely do not upgrade to this. You will lose your jailbreak and that’s definitely not worth it for this. Do Not Upgrade to iOS 7 Until A Jailbreak Is Released.
Fakers buy instructions about downgrade iOS 7 to iOS 6.1.2. It's 100% fake. Don't believe it. It's 100% scam.
You can downgrade iOS 7 to iOS 6.1.3, 6.1.4 (iPhone 5)