The developer behind the well known TinyUmbrella program has confirmed that a new upcoming update to his program will allow you to restore your iPhone, iPad and iPod touch to a selected iOS firmware without having to use iTunes.
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.