SHSH blobs are in the process of being phased out in favour of the tougher-to-beat APTicket.
Important: For this reason, you shouldn’t upgrade the software on your phone or restoring to stock if you depend on your jailbreak for an unlock.
Your reasons for restoring will vary, but one reason people often choose to get rid of their jailbreak is to install the latest (not yet jailbroken) version of i OS.
At the time of writing, that’s 7.1.2 and it’s already been jailbroken – but that doesn’t mean you can simply upgrade using the option in .
For most, that option simply won’t work and others have reported experiencing battery life problems and activation issues when updating on top of a jailbreak.