If you have tried our method to jailbreak iOS 4.3.1 using RedSnow and you might be stuck in the jailbreaking process, when it says Uploading RamDisk. While I was jailbreaking my unlocked iPhone 4, I was stuck twice when RedSnow screen says Uploading RamDisk and nothing happened for 45 minutes.
If you are also stuck in the same situation, here is a quick work around. When you run RedSnow, run it as administrator and go to Windows task manager and set the RedSnow affinity to Only CPU1.
That’s it and now follow our guide to jailbreak iOS 4.3.1 using RedSn0w and you will not face uploading ramdisk stuck issue any more.
Do let us know via forum if you still face any issue while jailbreaking your iPhone.