Quick update for iphone 4 jailbreakers . TinyUmbrella App that is required to save your SHSH Blobs [needed for downgrade to older firmware ] is updated to support iOS 4.2.1 firmware . In this update , the TinyUmbrella program gets a new interface .
Here are the direct download links for TinyUmbrella Firmware . Download size is 4.5 MB .
How to save SHSH Blobs ?
Connect your device with your computer . Download and launch TinyUmbrella Software . The program will then automatically detect your connected device and list it at the left panel . Select your device from the list and click on Save SHSH tab at your right. TinyUmbrella will then start saving your SHSH blobs in Saurik’s Server . It will also save a local copy of the .shsh file on your computer [ by default in C:\Users\YourName\.shsh]. This location can be changed by going into the Advanced tab and manually changing the file location.
Under General tab , it will show all the saved SHSH blobs along with their serial number [shown in the image below].
I think the new interface is more wide than required , and the developer could have fit the same things in a smaller window .
Quick Update : Here is the tutorial to Upgrade to iOS 4.2.1 without updating Baseband
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