Here is a new news for jailbreaking your idevice from and ex-Apple employee who has managed to jailbreak iPhone 3GS on iPhone OS 4 Beta so easily and as we know there are some good options to choose for jailbreaking your idevices like jailbreaking your iphone, jailbreaking your ipad and recently we posted about the redsn0w 0.9.5 jailbreak tool for iPhone OS 4 which works on iPhone 3G only but KaatjeNL’s jailbreak method worked on iPhone 3GS too and now You even don’t need to upgrade your baseband for this purpose and you can simply enjoy iPhone OS 4, fully jailbroken on the older baseband just with an unlock using ultrasn0w.
This was done by patching various files in the firmware and then cooking a custom firmware to restore it using iTunes on iPhone 3GS which will keep the older baseband intact.and here is what he has to say
This is a work in progress but I thought I would share the results so far. Cydia still has some issues, many applications install but crash, some examples include mobileterminal, sbsettings, five icon dock. 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. Many thanks to @p0sixninja for many hours patiently showing me the tricks and tips of jailbreaking 4.0b3 and then setting me out on my own to do beta 4. Without his tutelage, this would not have been possible
There is not yet any release for its release date and you can also try other tools to jailbreak your idevice for jailbreak iPhone OS 4.0.
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Keep posting stuff like this i really like it