Can i install iOS 5 after installing iOS 6?:

GD: NO.
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.
.
So…

If you have already installed new iOS 6, read here:

1) iOS 6 don’t have Youtube (How to install Youtube on iOS 6)
2) iOS 6 don’t have Google Maps. (How to install Google Maps on iOS 6)
3) iOS 6 don’t have Cydia Store. (How to install Cydia on iOS 6)
4) Restore Your Information from iCloud (How to restore your information from iCloud on iOS 6)
5) Optimize Your iCloud (How to optimize iCloud on iOS 6)
6) iOS 6 don’t have Jailbreak (How to Jailbreak iOS 6)
7) iOS 6 don’t have Angry Birds (How to Download Angry Birds for iOS 6)

Jailbreakers: Do not upgrade to iOS 6 until a jailbreak is released. You will lose all your jailbreak!