Notcom has updated and released TinyUmbrella 4.21.03 to save your SHSH blobs for iOS 4.3 beta 2 / iOS 4.2.1.It lets you to save SHSH hashes for iOS 4.3 Beta 2 which was release yesterday.If you have Apple Developer accounts, this means you can save your SHSH’s for that version and restore to it permanently.
If you don’t save your SHSH blobs now, it may be possible that you may not come to jailbroken iOS 4.2.1. To save SHSH blobs for your iPhone, iPad, iPod touch just download the TinyUmbrella file.
Download TinyUumbrella 4.21.03 for Windows, Mac & Linux to Backup SHSH blobs for iOS 4.2.1 /4.3 Beta 2.
download full procedure with setup of tinyumbrella at http://www.cracksheaven.com/2010/10/tiny-umbrella-tool-to-downgrade-your.html