You can find more information about downgrading here. Follow the tutorials linked below for instructions on how to save your SHSH blobs.
Save Your SHSH Blobs With Tiny Umbrella:
Save Your SHSH Blobs With iSHSHit
Note: SHSH Blobs are only useful for A4 devices at this point in time; however, it's always a good idea to save them in case a way to use them is found in the future.
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