How can I downgrade my iOS from 4.2 to 4.01?

What's the easiest and most simple way to downgrade your ios iDevice?

• I have an ios 5.1 iphone 4 and I want to downgrade to an ios 5.0.1 so I can have an untethered jailbreak instead of semi-tethered. I already have the ios 5.0.1 firmware but never got the SHSH blobs from my phone. Is it possible for me to get it from someone else's device or will i have to do tome other method. What's an easy way for me to downgrade my phone or maybe theres a good video that can tell me......

• Answer:

  No, its not possible People saying that its possible are fake and have no knowledge about iPhones. If you din't get a chance to save the shsh blobs then you are out of luck. There is no way, absolutely no way to get shsh blobs for iOS 5.0.1 because these are unique for every device and these are encrypted and only Apple server has the decryption keys. I'd suggest you to wait for a while as the jailbreak developer pod2g has been working on an untethered jailbreak for iOS 5.1.1 and just today he announced on twitter that he has successfully jailbreaked his iPhone. http://www.geekyapple.com/search/label/pod2g? My Advice : Take a backup of your shsh blobs now for iOS 5.1 before apple stops signing using tiny umbrella or iFaith You can check the status of iOS 5.1.1 jailbreak by visiting http://geekyapple.com once a week, so if you see any news that it has been released, go and grab it :)