iTunes 9.2
to install this open iTunes and click on the help menu, then on check for updates. iTunes 9.2 is required to install & sync IOS4, and was previously only available in a beta version on the Mac. Ensure you restart the PC after installing iTunes, Safari 5 and any pre-requisite files the installer reports, such as the mobile.me extension
Restore Files
After you have installed iTunes 9.2, check on the Internet for the IOS4 GM (Gold Master) IPSW restore file for your particular model of iPhone / iTouch etc. I downloaded my restore file from the Apple developers site, but the same one is found on various sites such as here.
Update the O/S
Connect your iPhone to iTunes, ensure it does a backup, transfer any purchases also.
Select your iPhone, Shift Click on Check for Update and you will get a dialogue box, browse for the correct ipsw restore file you have recently downloaded and start the update.
Don’t worry when it reports that it will validate the file with Apple, this is for your safety and will check the validity of the file, and no doubt check for jailbreak code too…
The Operating system is installed followed by a firmware update, and lastly by a verification and restore of Apps, Music, Videos etc, this all should take 10-15 minutes.
Thats it!
IOS4
simples
