There are actually two ways to do this, the first is using the i OS device itself but there are caveats and limitations with that, and then there is the traditional method of downloading the update files directly from Apple without i Tunes, which is particularly helpful for those who rely on download managers or who are just encountering trouble with i Tunes automatic updates.We will cover both methods of obtaining i OS software without using i Tunes to download it, we’ll start with the easiest method of using the device itself to get the i OS update. Thanks to OTA (standing for Over The Air) updates, you can also download updates to i OS directly on an i Phone, i Pad, or i Pod touch without even using i Tunes.
Step 2: Click on device button to the left of i Tunes Store button at the top right corner in i Tunes.
Step 3: Click on "Check for Update" without pressing any keys.
Step 1: Connect your i OS device to computer via USB cable.
Open i Tunes and check if your device is recognised in i Tunes.
Unfortunately, Saurik's server do not saves SHSH blobs for any i Device until it is requested to do so.