These are instructions on how to backup your SHSH blobs using Firmware Umbrella. You can find the Windows version of this tutorial here.
Download the latest version of Firmware Umbrella from here to your Desktop.
Double click the downloaded TinyUmbrella.pkg file then follow the prompts to install the application.
Connect your iPhone to the computer and double click the TinyUmbrella icon in your Applications folder to launch the program.
If asked, enter your administrative username and password.
Make sure your iPhone is selected from the list on the left, then click the Save SHSH button.
Once completed you will notice a new entry in the Saved SHSHs for iPhone list confirming the successful save of your SHSH blobs.
**Thanks to semaphore for his work on this tool!
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- Posted using my iPhone 4