The developer behind TinyUmbrella, Notcom, has released TinyUmbrella 4.21.04 version which supports the saving of iOS 4.3 b2 firmware’s SHSH blobs. Earlier, version 4.21.03 was released by Notcom for the same purpose, but as it had some bugs, he fixed it and released the TinyUmbrella 4.21.04 version now.
This is what he said in his blog :
I’ve just added iOS 4.3b2 support. For those of you with Apple Developer accounts, this means you can save your SHSH’s for that version and restore to it permanently.
Download TinyUmbrella 4.21.04 from here