If you can't wait for the public release of iOS 6 and just want to try out ios 6 beta on your device without having developer account, you are at the right place for the instructions to do so. In this tutorial you will learn how to install iOS 6 beta on your iPhone, iPad or iPod Touch without having UDID developer account.
Please note that this tutorial is for educational purpose only. You are recommend to get iOS 6 beta releases by signing up for Apple Dev center which costs $99/year.
What you need:
1. Perform a fresh iOS 5.1.1 restore on your device.
2. If you already installed iOS 6 beta on your device, downgrade back to 5.1.1.
3. Download iOS 6 beta 1 for your device here.
4. Latest version of iTunes. Get at www.apple.com/iTunes
How to Install iOS 6 beta without UDID registration
Step 1: Connect your device with computer via USB cable and run iTunes.
Step 2: Click on your device name found on the extreme left of iTunes.
Step 3: SHIFT + Click on Update button and then select the iOS 6 beta file you downloaded for your device.
iTunes will now restore your device to iOS 6. Stay calm.