TinyUmbrella now supports 4.3.1 for the relevant devices. Currently only iPhone 4 for verizon does not have 4.3.1 support (as there is no 4.3.1 available for the verizon iphone). Enjoy!With TinyUmbrella 4.30.05 you can save iOS 4.3.1 SHSH blobs for iPhone 4, 3GS, iPod touch 4G, 3G, iPad 2 and iPad 1.
Download TinyUmbrella 4.30.05 for Mac
Download TinyUmbrella 4.30.05 for Windows