Source: TheTechJournal.com
Download TinyUmbrella
Download iTunes 9.2 (iTunes version between 9.0 to 9.2 should work)
Simple Mode
1. Run 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).
2. Now Connect your iPhone 4, iPhone 3GS, 3G, iPod Touch 3G or iPod Touch 2G or iPad to your computer
3. Now Simply Hit the Save My SHSH button and TinyUmbrella will grab SHSH blobs of the latest firmware for the connected device. This will also generate a ticket to save SHSH blobs to Saurik’s server.
You have secured your future jailbreak by saving SHSH blobs for iOS 4 using TinyUmbrella. You can find the saved SHSH file under:
Advanced Options
