DevTeam worked hard for the last several hours and released jailbreak tool for iOS 4.2.1. It is redsn0w 0.9.6 b4.
As usual we remind all ultrasn0w unlockers please stay away from this official firmware. Wait for the ability to create custom 4.2.1 IPSWs that don’t update your baseband!
New redsn0w 0.9.6 b4 uses limera1n exploit and will successfully jailbreak all devices. The only problem is that it is a tethered jailbreak, which means you will have to plug it to a computer and rerun redsn0w on every reboot. This so called tethered or semi-tethered jailbreak. This condition applies to iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC model), iPod touch 3G and iPod touch 4G. Hackers are working hard to create untethered jailbreak for these devices. To use future untethered jailbreak you need to save SHSH keys for iOS 4.1 using TinyUmbrella utility or directly in Cydia.
Old devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (non-MC model) can be jailbroken-untethered right now using this latest version of RedSn0w.
Yesterday iTunes update was found to have issues with those of iPod Touches and iPhones that were tethered jailbroken with blackRa1n. If you have one of these, you will be unable to rejailbreak your device after rebooting it with blackra1n. The problem is being experienced only by Windows users. iH8Sn0w has an explanation:
“Blackra1n hooks to the dll that has different offsets of what it is actually looking for”.
To solve the problem iH8Sn0w released a blackra1n fix for a new version of iTunes. It’s named BlackBreeze and it supports 32bit + 64bit Windows versions and can be downloaded here. Please note that this fix is not an official update from Geohot. You can also try to replace new iTunes dll-files with the old ones or install iTunes 9.0.3. The latter is available here (don’t forget to uninstall the current version and reboot before the installing of another one).
Today Apple began selling iPhones without AT&T plan. Apple’s new policy is that anyone can walk into an Apple Store and pick up an iPhone 8GB for $499, 16GB for $599 and 32GB for $699. They allow one unit per customer per day, up to 10 iPhones.
The iPhones are still locked to AT&T’s network. Of course, these devices will be sold with the latest baseband which is not yet unlockable; however, you can use RedSn0w to perform a tethered jailbreak.
Sn0wBreeze 2.9.6(pwnagetool for windows, supports untethered jailbreak of iOS 5.1.1 for iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G, iPad and Apple TV 2G)
Sn0wBreeze 2.9.3(pwnagetool for windows, supports tethered jailbreak of iOS 5.1 for iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G, iPad; untethered for iPhone 3GS with old bootrom; untethered for iOS 5.0.1, iOS 4, iOS 3 supports Apple TV 2G)
Sn0wBreeze 2.8b11(pwnagetool for windows, supports iOS 5, iOS 5.0.1, tethered jailbreak for iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G, iPad, Apple TV 2G; untethered for iPhone 3GS with old bootrom)
Current version is ultrasn0w 1.2.3, download in Cydia (unlock for iPhone 4, iPhone 3GS, iPhone 3G, firmwares 3.0-4.3.3; it supports basebands 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00)