Iphone 4 downgrading iso version to 5 rather than 6.1.3?

Is there any way i can download my iso version of the phone i'm on 6.1.3 and i'm sure you can work out why i want to downgrade but i can't find a way on the net that does work, many thanks

also it is on uk vodafone.

Many thanks in advnace

Added (1). If i have what saved

Wirelessly play music from my iphone through my stereo?

I have a kenwood in-dash system that allows me to plug my iphone into it to play music(through the charging port not aux cable) anyone know how i could get my iphone to stream music through it wirelessly with an accessory i could plug into it (not a feature the in-dash system has)

Why did I get charged $1.00 twice from Apple iTunes?

Today I bought an iPhone 5, my first Apple product. Before I could start putting apps on the phone I needed to make an account. It took a few attempts because the final page wouldn't load after filling in the information. It asked for my bank card information and later upon going to transfer some funds I noticed two identical charges of $1.00 each from:

DDA PREAUTH APL*APPLE ITUNES 866-712-7753 CA

This makes me really nervous because upon googling for an answer I found many people getting enormous charges from very similarly named accounts. I wouldn't be so worried if it were just one charge, but it's two. Has something gone wrong… Should I be contacting someone at Apple about this?

Iphone 4 won't turn on + has battery?

My iphone 4 isn't turning on, its been working all day, and now it won't turn on, its been plugged into the mains adapter, the two buttons have been pressed for over 2 minutes and nothing has happened, can i do anything at home or do i need to go to orange or would i need togo to the apple store?

How to tether an iPhone 4S to a Nintendo DSi?

And an iPhone 4S. For some reason, when I search for an acess point (with hotspot on) no results show up. It says "Could Not Find an access point." Is there something I'm doing wrong?
I've also tried at a general wi-if location (my college) and the same thing happens.

IPhone 5 on Sprint unlimited everything.is this what's best for me?

I've been looking around at phone stuff

I do want an iPhone for easy syncing to iTunes & keeping track of playcounts, and iPhone 5 is the best one of those out so there's that

But then for plans, it seems that Sprint allegedly offers the best in data, everyone else lies apparently

Others say "unlimited data" (AT&T, Verizon) but then really mean 6gb, others (T Mobile) says "unlimited data" and then choke your speed down to 2G once you pass the 500mb mark…

It looks like this allegedly would cost $100 down and then $110 a month. To have my ideal phone under an ideal plan.

So my question is… Am I missing anything? Is there any way to get the same truly unlimited everything on an iPhone 5 cheaper elsewhere?

Added (1). Well facebook is 1 thing, but I want to be able to stream music with Rdio and videos with youtube up to 16 hours a day if I want to O_o

Added (2). But also, Verizon basically already told us "Go *** yourself"… Some kind of past billing issue in our family with them or something:/