Many non developers have also got their hands on the ipsw. Now the issue with installing beta firmware on your device when you are not a developer is that the UDID of the device needs to be registered.
Here’s a write up on how to hacktivate iOS 5 beta 1-4 on iPhone, iPad and iPod touch without any developers account. Let me assure you, once you have done this procedure, your device will sync normally with iTunes and will also allow you to use the network on your iPhone.
Follow these steps:
Step 2: Restore with iOS beta4 using iTunes 10.5 beta4 .
Step3 : Jailbreak iOS 5 beta4 using redsn0w. Please note that this won’t work on the iPad 2 as it can’t be jailbroken right now. Boot your device tethered after the jailbreak and don’t proceed with the set up procedure just yet.
Step 4: Basically, you need to navigate in to the filesystem of your iOS device and delete a certain key and string. To do that, you obviously need software. i-Funbox for Windows or iPhoneExplorer for Mac.
Step 4: Launch whatever software you are going to use for this and navigate to this path:
Right click on systemversion.plist and open it in the notepad. Now locate the following key and string:
You must remove this key and string and save the changes to the .plist file.
Step 5: Restart your iPhone, iPad or iPod touch. That’s it! Now connect it to iTunes and you’ll see that it syncs flawlessly without a UDID registration. iPhone owners will also be able to use their networks.
*Note: Only those iPhone owners who have officially unlocked iPhones or carrier locked ones may upgrade to iOS 5 beta firmware as no software unlock for iOS 5 beta is available. Even Gevey interposer has been blocked in iOS 5 beta .
and also you can see this video guide for Activate iOS 5 Beta Without Developer Account :