HOW TO: Manually Jailbreak iPhone 3Gs With New Bootrom Running iOS 4 With Sn0wBreeze [Windows] Post from: FSMdotCOM A few days ago, iH8sn0w released a new video where he demos the jailbreak of iOS 4.0 running on a iPhone 3Gs with the new bootrom and we told you that a new sn0wbreeze update is coming soon. Well, is seems that ‘soon’ is not soon enough, and today we will show you how to jailbreak your 3Gs manually. NOTE: read the tutorial twice before you attempt this, and make sure you understand everything. The tutorial was written by iH8sn0w and we modified it to make it as simple as possible , so everybody can understand it. But still, the stuff you are about to read is pretty advanced and not accessible to everybody so, if you still don’t understand it, well… wait for the update. NOTE: this is a tethered jailbreak. That means that everytime the iPhone reboots, you need to connect it to a computer in order to turn it on. Requirements: BACKUP YOUR iPhone via iTunes or you can manually backup iPhone 3Gs with new bootrom ( use iDetector to check if you got an old or new bootrom ) 3.1.2 SHSH blobs saved ( if you don’t have them, you can stop here… there’s nothing you can do ) difrnt’s iBSS grabber Payload Pwner-r2 for the 3Gs sn0wbreeze V1.6.2 iBooty LibUSB ( details in the post ; 64-Bit users read carefully !!!) 3.1.2/4.0 3GS firmware downloaded on your desktop STEP 1 : Grabbing your 3.1.2 iBSS file 1. Pointing your hosts If you have your SHSH blobs saved on Cydia/Saurik’s server then follow this tutorial If you have your SHSH blobs saved locally, use TinyUmbrlla 2. Restoring to grab the iBSS file. Place your device in DFU. Start up the iBSS/iBEC grabber. Put the save folder on a new folder on your desktop. Hit “Start Monitoring”. Now go back to iTunes and do SHIFT + Restore. Then browse for your 3.1.2 IPSW. You will need to restore to 3.1.2 in order to pwn 4.0. 3. Saving your iBSS After Restoring, Go to the folder that you have specified to save your iBSS file. You will see folders like (Per**.tmp). Go into one of them, and you’ll see a folder called “Firmware”. Go there. Then go to the folder “dfu”. Copy the iBSS file to a safe place, then you can remove the folder created by the iBSS Grabber. STEP 2 : Creating a custom 4.0 firmware Using Sn0wbreeze 1.6.2 create a custom firmware. If you don’t know how, check this tutorial NOTE: Ignore the warnings after browsing for the ipsw STEP 3 : Installing LibUSB for iRecovery NOTE: If libUSB is not installed properly, your USB might no longer work! NOTE: If you are not sure what’s running under the ‘hood’ , you can run this mini tool to detect your O/S + Architecture