Over the Christmas weekend, the iPhone Dev team released a version of redsn0w that implements the "backup plan" to the 4.2.1 untethered jailbreak. "If you've an iPhone 3G, or an old-bootrom ipt2g or iPhone 3GS, you already have an untethered jailbreak!" Just use the latest public redsn0w.
Right now, "backup plan" requires 4.2b3 IPSW on your Mac, and that Cydia has your 4.2b3 SHSH hashes. Please don't pirate that 4.2b3 IPSW! We're also working on a way that this technique might apply to all those with 4.1 IPSWs, but that's not the first goal right now.)," stated the team.
Here're some important points:
- For the same reason, please don't participate if you rely on the ultrasn0w carrier unlock. Wait for the final version!
- Until we fix some sandbox issues with bluetooth, the bluetooth functionality is disabled.
- Cydia must have your 4.2b3 SHSH blobs saved on file. (As we approach a general release, we'll provide a way to let you use locally saved hashes too).
- You must already have usbmuxd software installed and running on your Mac (this requirement will eventually go away too). The correct invocation of the relay is just as that page says: "./tcprelay.py -t 22:2222". If the relay isn't installed or running correctly by the time the redsn0w ramdisk has started, you'll need to restore to stock FW again to try it again. Please test it beforehand to save yourself some time!
Download: redsn0w 0.9.7b3