ios 3.1.3 jailbreak not working mac ipod touch

To work-around this obstacle, you need the data (SHSH blobs) that Apple’s server would ordinarily send back to iTunes to greenlight the iOS 3.2 install. Apple’s server would block the downgrade, as it permits only iOS 3.2.1 to be installed. Without any advance preparation, this would still fail. Using a variation of the basic Option-Restore method (as explained below in “Downgrade and Restore”), you select the iOS 3.2 Software Update file. Suppose, for example, you want to downgrade your iPad from iOS 3.2.1 (currently the most recent version) to iOS 3.2. The primary method for circumventing Apple’s roadblock is to fool iTunes into thinking that Apple has approved the (downgrade) iOS version your are attempting to install. In today’s column, concluding this two-part series, I explain how you can none-the-less work-around Apple’s obstacles and achieve downgrade success! This is why you cannot downgrade an iOS in any simple manner. Apple has set this system up so that only the most recent compatible version of the iOS for a particular device is accepted. If Apple’s server does not send iTunes the “correct” “SHSH blobs” for the version of the iOS you want to install, the install is blocked. In addition, I went into the details behind Apple’s main downgrade roadblock: On newer iOS devices (starting with the iPhone 3GS), before you can install any iOS Software Update, there is a required online exchange of data, mediated via iTunes, between your iOS device and an Apple server. In my previous column, I described the numerous reasons why you might want to downgrade as well as the rationale behind Apple’s effort’s to prevent you from doing so.

This is because Apple has done its best to prevent downgrading.

Depending upon the particular device you own and iOS version you are running, your ability to do a downgrade can vary from slightly tricky to virtually impossible. You’ve decided that you want to downgrade the iOS software on your iPhone or other iOS device.

Ios 3.1.3 jailbreak not working mac ipod touch