TinyUmbrella is a useful application that was especially designed to provide users with a means of saving the SHSH blobs for their devices.

Thus, TinyUmbrella can also help in restoring your iPhone or other iOS device using a saved SHSH and by starting the TSS Server. This way, with TinyUmbrella you can restore the firmware of your device in a really simple manner.
What's New in This Release:
TU has been updated for 7.1.x support but beware there are still some issues I’m working through for the iPhone 5S. I’ve got something screwy with the request that is going wrong but I haven’t figured it out yet. I’ll update a fix as soon as I figure what I’m doing wrong. It’s likely something stupid.
Sorry it’s not perfect. For those devices that still can downgrade this should work. For those that we cannot downgrade yet, it still doesn’t hurt to save what we can just in case.