How To Save Your SHSH Blobs With TinyUmbrella
Step 1) - The first thing you will need to do is download TinyUmbrella to your computer. You can do so by clicking here (scroll down to TinyUmbrella section and download the version that is bold).
Step 2) - Once you download TinyUmbrella to your computer launch it and you should be presented with the interface show below.
Step 3) - The next thing you will need to do is plug your iDevice into your computer (if you have not already). Upon doing so TinyUmbrella will detect it in the connected devices tab.
Click on your iDevice in the connected devices tab now.
Step 4) - Once you click on your iDevice you will need to simply click the Save SHSH button in the top right hand corner of the screen and TinyUmbrella will begin saving your available SHSH blob. When the process is complete you should notice a list of saved SHSH blobs.
If all went well, you have now saved your SHSH blobs for the firmware version you are currently running.
If you did not get success with saving your SHSH blobs you may need to double check that Apple is still signing your firmware version. You can double check this at the developer of TinyUmbrellas website. When you are sure your firmware version is still being signed by Apple you may need to do the following:
Go into the Advanced Tab and uncheck the following:
When you Uncheck Request SHSH From Cydia go back to step 1 and try saving your SHSH blobs again.
Learning How To Downgrade Your iDevice With TinyUmbrella
Step 1) - When you have your SHSH blobs saved, and actually want to make use of them to downgrade your iDevice to a lower firmware version. You will need to once again launch TinyUmbrella, plug in your iDevice into your computer and click the Start TSS Server button.
Step 2) - Once the TSS Server has been enabled you will need to launch iTunes. With iTunes up and running click on your iDevice and then hold down the Shift key (Windows) or Alt key (Mac OS X) and click Restore button. Upon doing so a new dialog window will appear where you will need to select the firmware file you wish to restore to. Do this now, and your iDevice will begin being restored.
Step 3) - Once your iDevice has finished restoring you should encounter error 1015. When you receive this error all you will need to do is launch TinyUmbrella and click the Exit Recovery Mode button. Upon doing this your iDevice should reboot and function as normal. Congratulations, you have now downgraded your iDevice.