Is upgrading IOS 7 reversible?

I know how to do it but I have a couple of questions about it
• Is it reversible
• Can I still update and download apps
• will I lose my warranty

PS I have an iPhone 4 that's what I would put IOS 7 on

Apple doesn't allow to go back. Only way is to find it on third party websites and jailbreak to go back.

Actually, it is reversible if you put your device into recovery mode. Since you can just go back to iOS 6, it doesn't void your warranty. And of course you can update and install apps.

However, please be aware that if you install iOS 7 without having your device's UDID registered, Apple will deactivate your device. You need to register your UDID on a site like http://www.instantudid.com/.It's $5, and they literally registered my 4S instantly.

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