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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.
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.
What APTickets are is essentially the next generation of SHSH blobs.
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.
Newer devices like the i Pad 2, i Pad 3, i Phone 4S, i Phone 5 and i Pod Touch 5G has different restrictions however, because they are not vulnerable to the limera1n exploit and are governed more-so by APTickets.
These devices can only be downgraded on the i OS 5 firmware generation and require saved SHSH blobs and APTickets for the i OS 5 firmware version you are currently running and are trying to get to.