Here are the steps you need to do to backup SHSH blobs using firmware Umbrella. These instructions are for you to use a Mac.
step 1
Download the latest version of Firmware Umbrella to your Desktop. Click here.
step 2
Double-click the file TinyUmbrella.pkg file and follow the instructions to install it.
step 3
Connect iPhone to the computer and then double-click on TinyUmbrella icon in the Applications folder to run the program.
step 4
If this window appears, enter the username and password
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