Semaphore has announced an update to TinyUmbrella, a utility for saving SHSH Blobs, that brings support for the Apple TV on iOS 4.4.3.
Sorry I skipped this version. I've updated TU to work with Apple TV 4.4.3. For those of you with Apple TV 2 - be ABSOLUTELY sure you have your 4.4.3 SHSH for your device... It may be QUITE important.
You can find instructions on how to save your SHSH Blobs for the Apple TV here. Click Read More for download links.