Can I Downgrade to ios 6 again once I've upgraded to 7?

I'm planing to upgrade my iPhone (4S) to ios7 beta. I know all about beta and that it may and will have bugs and crashes, but I just can't wait: D

But if it's horribly crashing I would want to recover back my ios 6.1.3

Can I do this using iTunes restore?

First of all, you need an Apple Dev account to get the iOS 7 beta (I have one but I won't share). Second, after you update to a "higher" firmware, you can't downgrade. UNLESS there's a jailbreak. But THERE ISN'T. IOS 7 is gay btw. I just got it and regret it. Good thing it was on my trash iPod