Sn0wbreeze 1.7 for 4.0 (for Windows) has been released. This release supports iPhone 3GS (old and new bootrom), iPhone 3GS, iPod touch 2G (MC and non-MC models), and iPod touch 3G. Though iPhone 3GS (new bootrom), iPod touch 2G (MC models) and iPod touch 3G will have to be either on 3.1.2 firmware, or will need to have their SHSH blobs saved for iOS 3.1.2 in order to successfully jailbreak these devices on iOS 4. Also the jailbreak for iPhone 3GS (new bootrom), iPod touch 2G (MC models) and iPod touch 3G on iOS 4 will be tethered, which means whenever you turn off your phone, you will need to re-connect it to a computer to be able to turn it back on.
The step by step guide to jailbreak these devices is almost exactly similar to the last release. Simply follow the guide posted here to jailbreak your iPhone on iOS 4 using Sn0wbreeze 1.7. Once you have created a custom firmware file, you can simply restore to it via iTunes 9.2. If there are any changes, we will redo the guide and post it again here.
Those of you who are using Mac OS X will have to follow this manual guide posted here to jailbreak iPhone 3GS (new bootrom), iPod touch MC models and iPod touch 3G – all tethered.
Once you have jailbroken your phone, you can unlock it using ultrasn0w 0.93 (on any baseband), guide for which is posted here.
If you don’t have your 3.1.2 (NOT 3.1.3) SHSH blobs (ECID SHSH) files saved, you will have to then wait for the next version of Spirit which is likely to be released as soon as Apple releases the next firmware update i.e. iOS 4.0.1 / 4.1 and it will support all iOS devices including iPhone 4.
UPDATE 1: ok guys, you will need to follow the following instructions to jailbreak iPhone 3GS (new bootrom) on 3.1.2, or with 3.1.2 SHSH blobs saved.
Download Sn0wbreeze 1.7 for Windows