What is an SHSH blob?
Put simply, an SHSH blob is a handshake or signature from apple that allows you to install their firmware on your device. When a new firmware is released apple will stop singing the previous release, not allowing you to install that firmware. What Tiny Umbrella does is make a copy of the "handshake" and saves it for use later, allowing us to install any firmware at any time (providing we have the correct "handshake" or SHSH blob).
So lets begin.
Step one - Getting Tiny umbrella.
The first thing we need to do is download the latest version of Tiny Umbrella. i have supplied a link to the most current versions below...
Once downloaded, proceed as you normally would installing any software.
Continue and accept your way though the setup process until you have Tiny Umbrella installed.
Step Two - Getting ready
Now we have successfully installed Tiny Umbrella we can start it up. By now we have connected our device to our computer using apples supplied 30 pin USB transfer cable. Upon first launch you will get a dialog box explaining that Cydia is currently saving SHSH blobs.
I suggest you take their advice and disable "Request SHSH From Cydia" under the "Advanced" tab, in the middle of the app window.
Step Three - Lets save some SHSH blobs.
Now that's all sorted we can proceed to save our SHSH blobs. On the left hand side of the application you will notice a column that displays any devices connected to the computer. Select your device and hit the "Save SHSH" button towards the top right hand corner of the application window.
This will quickly pull any and all SHSH blobs from your device and save them to the directory selected under the "Advanced" tab.
Congratulations! You have now successfully saved all available SHSH blobs for your device. Tiny Umbrella will list all available blobs under "General" when your device is selected in the left hand column.
Check out my other Tiny Umbrella tutorial HERE (under construction) for instructions on how to downgrade your firmware using the Blobs we pulled in this tutorial.