How to Revert From iOS Beta 5 to 4.3.3
Ok so you installed the iOS beta 5 on your iPad 2 and then realized it wouldn’t play any video. Well that’s what happened to me anyway, as it turns out you can’t easily revert, you have to trick iTunes into allowing you to revert back to 4.3.3. The way to get back to 4.3.3 for me was to put the iPad into DFU mode and then hook it to iTunes. This caused iTunes to detect an iPad in restore mode and then put 4.3.3 back on. When I tried to downgrade it in both iTunes and Xcode in regular mode it crapped an error out on me.
Putting the iPad into DFU mode is relatively simple. First hold down the power and home button until you see it reset. Just a second or two after resetting let go of the power button. Continue holding the home button for around 15 seconds. If you have it hooked into the computer iTunes should pop-up and indicate that it sees an iPad in restore mode. Then just let it restore, it should pick 4.3.3 to restore with automatically.