[Tutorial] How to install iOS 5 beta 1?

Apple has released iOS 5 beta version to developers for testing purposes. Normal users may need to wait for another couple of months before the official iOS 5 is released. For more information about the iOS 5, please click here.

Review  

Personally I have tested iOS 5 for both my iPhone 4 and iPad 2. I like the enhancement of the functionality of the camera, integrated iMessage and the notification features. However, it is unstable as some apps are not supported or quit unexpectedly. The device may also reboot itself frequently.
I would strongly recommend users not to install iOS 5 beta version and wait for the official iOS 5 to be released unless you really want to give it a try. Please remember to backup your data before the installation of iOS 5.

There are two ways to install iOS 5 on your i-devices. You must either be enrolled as an iOS developer or have your i-device UDID registered.


1st Method
Click here to register as an iOS developer (USD$99 per year).


2nd Method
Alternatively, you may register your UDID through an agent. It costs you around US$10.
Reliable agents are iOSActivation and RegisterUDID


Once you have your UDID to be registered, you are now ready to install iOS 5 beta version. 
Download iTunes 10.5 Beta and iOS 5 Beta firmware


What is UDID?
Each iPhone, iPod touch or iPad has a Unique Device Identifier (UDID) which has a combination of 40 letters and digits. It is similar to a serial number but harder to crack. It looks like 32232jhn2n3m2n3m2n3jd9duopl9eieorjwmwnf8.


How to obtain UDID?
Connect your device with a computer, open iTunes, simply click on serial number and it will switch to UDID.