You see, when Apple is still signing a firmware version you can save the SHSH signature so that in the future if you wish to downgrade back to that firmware version it is indeed possible.This is essentially performing a replay attack, in the fact that data is being fraudulently retransmitted.
If you are Jailbroken then most of the times your SHSH blobs are already saved on Cydia’s server automatically and you shouldn’t have to back them up manually.Sometimes Cydia doesn’t back up your SHSH blobs on your Jailbroken device however, and you might even prefer to do a local backup of your SHSH blobs. Additionally, you will also learn the best way to save your SHSH blobs which will allow you to downgrade your i Phone, i Pad, i Pod Touch and Apple TV firmware version in the future.Simply scroll through our section for the firmware version you are trying to downgrade to, and read one of our easy to follow how to guides on downgrading your i Phone, i Pod Touch, i Pad, Apple TV or even Play Station.APTickets are much more secure however, because when you try to restore or upgrade your i Phone, i Pod Touch or i Pad a request is sent to Apple’s servers to confirm the APTicket.
Unlike SHSH blobs which would submit the same one already stored on the server, a brand new APTicket is generated using a random string.
Note #1: This is not some magical section of guides that will allow you to downgrade your i Phone, i Pod Touch, i Pad or Apple TV 2G without having your SHSH blobs saved for prior firmware versions.
Meaning you had to have saved your SHSH blobs for the firmware version you are trying to downgrade to, or downgrading will not work.
Note #2: We will be updating this page with the latest how to downgrade guides when new firmware versions are released, so make sure you come back soon!
Downgrading your i Phone, i Pod Touch or i Pad to a lower firmware version is indeed possible, but unfortunately has become harder and harder over the years.
If you try to restore to a lower firmware version, you will get an error because Apple is not signing that specific firmware version anymore.