Save SHSH blobs for iOS 4.3
Download TinyUmbrella
STeps to save SHSH Blobs:-
Step 1Run the TinyUmbrella.(Mac users: Copy the app to your desktop or you’ll get repeating password prompts if you ran the app from within the DMG).Step 2Now Connect your iPhone 4, iPhone 3GS, 3G, iPod Touch 4G, 3G 2G, iPad or Apple TV 2G to your computer. TinyUmbrella will detect your iDevice.
Step 3Make Sure iTunes is closed
Now Simply Hit the Save SHSH button at Top-Right side of the window.
TinyUmbrella will save SHSH blobs of the latest firmware + all those blobs that you had saved for older firmwares (if any) on Cydia server. This will also generate a ticket to save SHSH blobs for the latest firmware to Cydia server.
Done...