How to downgrade my iphone 5 from iOS-7 to iOS-6?

I bought a second hand iPhone 5 since few days, iOS-7 Beta installed in. This iOS is unstable and does not run prefectly on my iPhone. I'm not a developper, just i would like to downgrade it to iOS-6 stable version. ANYONE CAN Help ME?

Iphone 5 screen cracked and back and sides dented?

So today i was jogging outside and as smart as i'm i put my iphone 5 in my sports shorts pocket. I was sprinting later and the iphone 5 launched out of my pocket and fell on the floor i picked it up and the lower screen has 3 different cracks and the sides are dented and the back is fairly scratched? Could i get another iphone 5 for free with the apple warranty or would i have to buy i new one? I just want a new one now? It would be great if someone could answer my question.

What's the name of an iPhone app extreme truck driving/flipping game?

I used to play a driving game on my iPhone a couple of years ago that I can't remember the name of! You select a vehicle and then one of four backgrounds (a desert, volcano, snow, etc.) and then start off driving then fall off a cliff where the operator makes the car do flips, which then in turn provides "gas" for the vehicle. The longer you continue driving without running out of gas or exploding the higher your score is.

I can't remember the name! Any help with the exact extreme truck driving game would be great!

I've already gone through 800+ apps and can't find it.

Is jailbreaking reliable 2013?

So basically I was wondering if jailbreaking is reliable if you don't download heavy tweaks and themes to use as your daily driver on an iPhone? How long have you had your iPhone or iPad or even iPod jailbroken without problems?