here is a new way source:
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Warning: This has only been confirmed to work on the 4th generation iPod touch, and has been confirmed NOT to work on the iPad 2. On devices with a cellular modem, this may permanently upgrade your baseband, and will also prevent activation with your carrier (since you are bypassing it).
Our user ipodsjor has outlined these steps:
Step 1: Restore to the iOS5 Beta using iTunes.
Step 2: On the setup screen, push the home button 3 time until VoiceOver activates.
Step 3: Hold the time on the status bar.
Step 4: Drag down the screen with 3 fingers.
Step 5: Tap twice on the Y!
Step 6: Push the home button.
Optional: disable VoiceOver and thank ipodsjor.