As Apple company makes pretty strict limitations on who can install iOS betas. So the only legal way for you to install iOS betas is to get your  Unique Device Identifier or UDID registered as an iOS developer. UDIDead tool frees you from need to obtain the official iOS developer account (which costs $99/year) by simply adding a custom bundle from redsn0w.

How to install iOS 6 Beta without UDID Activation

Step 1: First you need to Download iOS 6 beta and update your iDevice to iOS 6 beta using latest version of iTunes. Unfortunately there is no iPad 1st gen support for the newest iOS 6. When done download iOS 5.1.1 Download links for iOS 5.1.1 are available at that will be used to activate iOS 6 letter.

Step 2: Download the latest version of redsn0w 0.9.12b2 - Win or Mac . Then you need to run it from terminal (Mac)or command prompt (Win) using the  -S* argument (please make sure you are using the capital S letter).
Here is the examples of commands for rednow running on different OS.

Step 3: Now using redsn0w menu click on ‘Extras‘ and then ‘Select IPSW‘ . And browse for the iOS 5.1.1 firmware for your device, you have done at step one.

Step 4: Download the UDIDead bundle for your iOS 6 firmware version.  Once more thanks StanTheRipper for sharing this method. We hope he will make and upload more bundles for the future iOS versions.

Step 5: Now using redsn0w, click on ‘Jailbreak‘ button and just simply follow the instructions. You will need to enter DFU mode, then wait until presented with the option to select a custom bundle. When given the option, browse for the UDIDead bundle you just downloaded and click ‘Next’.

Step 6: After redsn0w has finished, your device will reboot. Now just activate your iDevice using the latest version of iTunes which you can download at Apple web site.

And that’s it. Now you know how to install iOS 6 without Developer account and UDID registration. And notice that it was for free. So share this essential info and give other hackers the possibility to find exploits for future iOS 6 jailbreak or test apps for iOS apps developers.