A rather complicated method for jailbreaking iOS 4.3 has been available since before the operating system was even released to the public. But the tools required you to use a Mac. Now the folks at Redmond Pie have put together a step-by-step tutorial for jailbreaking a device running iOS 4.3 using a Windows computer.
Basically you’ll need to download Sn0wbreeze 2.3b1 or later, iTunes 10.2.1 or later, and the latest version of iOS for the iPhone, iPod touch, or iPad.
Sn0wbreeze will allow you to jailbreak your device to run unsupported code and install the Cydia store for third party apps that aren’t approved by Apple. Unfortunately, this is a tethered jailbreak, which means you’ll need to connect your mobile device to a computer using a USB cable any time you want to reboot. There’s also currently no carrier unlock tool for iOS 4.3, so if you have an AT&T iPhone that you’d like to use with a different carrier, you should probably hold off on upgrading to iOS 4.3 altogether.
Update: As several readers have pointed out, this method of jailbreaking can cause problems with the Mobile Substrate framework, which many jailbroken apps rely on. So if you’re in a hurry, you can try it out today. But you might want to hold off until hackers have had a little more time to play with iOS 4.3 and make sure everything works properly before jailbreaking.
Update 2: It looks like there’s a new Mobile Substrate package which should fix at least some of the problems experienced by early jailbreakers.