Great news, iH8sn0w the developer behind Sn0wbreeze jailbreak tool is working on a new utility which will allow you to extract and save SHSH blobs of your iOS device. You may ask "what’s new in this?" since Cydia and TinyUmbrella makes the same job.
Here's the conversation between iH8sn0w & MacHackPC on Twitter:
iH8sn0w: @machackpc Something else is on higher priorityOn the other side, Semaphore the developer behind TinyUmbrella is working on a new update which will allow you to restore your iOS device without need to iTunes i.e. it may bypass all iTunes errors allowing you to downgrade and preserve your baseband without any errors. [BlogsDNA]
machackpc: @iH8sn0w Interesting. Do we deserve to know what that is ?
iH8sn0w: @machackpc its an shsh blobs extracting utility. Right from the device. Not apple.
machackpc: @iH8sn0w Uhh.. Interesting. Does it mean that, You can extract SHSH Blobs for Older Version FW's (For those Apple stopped signing?)
iH8sn0w: @machackpc whatever firmware the device is running.
machackpc: @iH8sn0w That would be awesome. So, if a device is running iOS 4.1, then you can save SHSH for iOS 4.1. Even though Apple stopped signing?
iH8sn0w: @machackpc correct.