Couple of days ago, the Redsnow 0.9.5 beta 4 was released by iPhone Dev Team to jailbreak the latest iPhone OS 4.0 firmware, but currently Redsnow jailbreak is only compatible with iPhone 3G only. So one of the iPhone hacker named as Kaatje has successfully managed to jailbreak iPhone 3GS running iPhone OS 4.0 beta 4 firmware by creating a new way of jailbreaking.
The hacker has only did this to motivate the developers team to get their apps ready for the final release of iPhone OS 4 firmware which will be unveiled at the WWDC 2010 and it is expected that after the release, support for other Apple iDevices will be added.
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According to the Kaatje’s website:
“I did this only to hopefully motivate the developers to get their applications ready for 4.0 as it is coming very soon and the last thing we need in the community is to have repos full of broken apps! I accomplished this by patching asr, lockdownd, LLB, iBEC, IBSS, iBoot, kernelcache, MobileSafari, Services.plist, and fstab. The binaries were patched with IDA Pro and OxED and were then diffed against the original pwned files with bsdiff to create patch files. I then took the diff files and built a firmware bundle that I dropped into Pwnagetool and updated the cydia tree within Pwnagetool as well. Once this was done, I created a custom ipsw with Pwnagetool, unzipped it, applied a pwned LLB from a pwnagetool generated 3.1.3 ipsw, zipped it back up and restored to my device. At this time I am unable to get my T-Mobile NL sim to work so I downgraded back to 3.1.3 after playing around with 4.0 for a while. I look forward to the release and the official unlock from the Dev-Team.”
The best feature of this jailbreak is that it doesn’t upgrade your phone’s baseband and retains it even after upgrading to iPhone OS 4.0 firmware, that means you can run jailbroken iPhone OS 4 on older baseband. She managed to do this by developing a custom ipsw firmware using Pwnagetool.
This jailbreaking method is expected to be available after the official release of iPhone OS 4 at the WWDC event which will be starting from June 7, you can find more details about the event here. [ Blogsdna via TGIL ]