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.
If you are looking for more information on how to save SHSH blobs and APTickets you will want to visit our How To Save SHSH Blobs section.
Note: Keep in mind that if you find a guide for a previous firmware version and don’t see one for your current situation, most of the time these guides are all-purpose.
In the future APTickets will completely replace SHSH blobs, this will happen once the i Phone 4S stops being supported.
The good thing is there is indeed still a way to downgrade your i Phone, i Pod Touch, i Pad or even Apple TV, but it relies on you saving SHSH blobs.
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.
For the most part, older i OS devices with an A4 chip can be downgraded to any firmware version as long as you have saved SHSH blobs and APTickets.
This includes the i Phone 2G, i Phone 3G, i Phone 3GS, i Phone 4, i Pad 1G, i Pod Touch 1G, i Pod Touch 2G, i Pod Touch 3G and the i Pod Touch 4G.
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!