Originally Posted by Kurohouou
You don't even need tinyumbrella to downgrade. I already tried the ios 5 beta, but went back to 4.3 because Netflix/Air Video/HBO Go pretty much any video streaming app didn't work with it. All you have do is plug your phone into your computer, start itunes, turn off the phone, reboot into DFU mode (While off and plugged in with itunes on hold the home and power button for 10 seconds, then release the power button and continue holding the home button until you get a prompt from itunes). Then just do a restore to 4.3. Very simple and easy.
4.3.3 I think you meant
But yes you're right. As long as Apple is signing the current IPSW version, no need for tinyumbrella