I had beta 7 installed and couldnt figure out how to get iOS5 PR on. People saying just download the GM version and use this. However this fix is less painful 1. make sure you have current itunes 10.5 downloaded and installed from apple.com 2. Plug you phone into itunes. 3. Turn phone off properly, by holding top off button and sliding across 4. Make sure phone is off and plugged in. HOLD power and HOME button for 10secs, till it says connect to itunes 5. You will see it says DFU mode on itunes. Click Restore. 6. It will then prompt you to download iOS5 through iTunes. (public version) 7. Follow onscreen prompts and it will install fresh iOS5. 8. restore from previous backup points to note. Your phone may come out of DFU mode during the DOWNLOAD of iOS 5. Once the iOS5 has downloaded, put it back to DFU mode to restore. Took a few attempts because of itunes servers however, successfully running public realise of iOS5 on both ipad 2 and iphone 4.