The developers of Tiny Umbrella just posted a note on his blog that he is working on the new version of Tiny Umbrella and this new version will allows you to restore your iDevice without iTunes.
Post on web:
I’ve been working on a new and improved version of TinyUmbrella that will, among other things, allow you to restore your iDevice without iTunes. With the holiday season and work, this will take me a bit to get working the way I want it. I appreciate your patience and your support. You guys are awesome No ETAs yet but I’ll post updates here and on twitter.
Also Check Our Guide On How to Save SHSH blobs with Tiny Umbrella.