Its not an app. Its for your desktop. The link to download was posted by ipad-sweden in this thread twice. Your SHSH blob isn't saved automatically.. you needed to click the "Make my life easier"button. Alternatively, there was a way to save it when using the Spirit jailbreak from your desktop.
Once you jailbreak and upload your SHSH blob to Cydia, it seems that Cydia will automatically save it for all subsequent versions. For example, I was jailbroken on 3.2, but never updated to 3.2.1. Using the TinyUmbrella program though, it allowed me to update to 3.2.1 even after Apple stopped signing the firmware.
Once you jailbreak and upload your SHSH blob to Cydia, it seems that Cydia will automatically save it for all subsequent versions. For example, I was jailbroken on 3.2, but never updated to 3.2.1. Using the TinyUmbrella program though, it allowed me to update to 3.2.1 even after Apple stopped signing the firmware.
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