iOS 4.3 is available in iTunes starting last night, but for now there is no jailbreak or unlock solution for this new version of iOS. Those who depend on unlocking should NOT update to iOS 4.3 because it is not known when they will be able to unlock their phones again. In order to protect those who update "by mistake", several methods have been devised to block iTunes from updating the software. The first of them is called Recovery Guard, we talked about it here and as soon as you install this little tweak in the terminal, you will be protected from any iOS update. Recovery Guard is installed from Cydia from the repo cydia.pushfix.info and as soon as you install it, you are immune to the update because iTunes will consider that you already have the latest version of iOS installed in your terminal.
A second method is available for Mac owners with iTunes 10.2.1 installed who must open Terminal, authorize themselves as administrators and type the following line of code into the console:
defaults write personalized com.apple.iTunes-installation-server-host / dev / null
To reactivate the possibility to update iOS from iTunes, reopen Terminal and type the line of code below:
defaults delete com.apple.iTunes personalized-installation-server-host
If you follow the steps above, you will be protected against accidental updates through iTunes.
