iSHSHit has been updated to support saving SHSH blobs for the iOS 4.3 / 4.3.1 firmware. Now iSHSHit can save iOS 4.3 / 4.3.1 SHSH blobs. For your kind information iSHSHit is a tweak which allows you to save SHSH Blobs for your current firmware version. It allows you to downgrade to older firmwares. One of the important feature of this tweak is that it can send your saved SHSH blobs via email. If you are looking for an alternative to TinyUmbrella then iSHSHit is for you. iSHSHit uses the Cydia on File service, so that your SHSH blobs will be saved on the Cydia servers.
iSHSHit is available in Cydia under the BigBoss repository for free of cost. You will need to have a jailbroken iPhone to install this tweak. If you don’t have jailbroken iPhone then you can follow the step by step instructions posted here to jailbreak your iPhone, iPod touch or iPad with Redsn0w on iOS 4.2.1.