TinyUmbrella has been updated to support the new iOS 4 on iPhone 3GS and iPod touch 2G/3G. iPad is also supported but iOS 4 for iPad isn’t available yet.
iPhone 3G is not supported because you don’t need to save SHSH blobs for iPhone 3G, and older iPod touch (non MC model).
This is important if you want to jailbreak (by downgrading) your device again should Apple patches the exploit used by the new unlock and jailbreak tools. It is also important to note that you wont be able to save SHSH blobs once Apple has released the new firmware (iOS 4.0.1 / iOS 4.1).
This is because Apple will stop signing the iOS 4 firmware once the new one has been released, hence negating you to save your iOS Device SHSH files.
Use the step by step guide posted below to save your SHSH blobs (ECID SHSH) of iPhone 3GS, iPod touch 2G/3G on iOS 4 without having to jailbreak your device:
Step 1: Download the latest beta version of TinyUmbrella (for Windows, Mac or Linux) here.
Step 2: Make sure you are running iTunes > 9.0. iTunes 9.2 is recommended.
Step 3: Start the program and plug in any ONE of the supported iDevices (iPhone/iPad/iPod touch).
Step 4: Click on “Save My SHSH”. TinyUmbrella will now grab the signature for you.
It will be enabled again once a ticket has been generated to save it to saurik’s server.
This is it ! You should be safe now. Make sure you save the signature for your iPhone, iPad and iPod touch on file before Apple releases the next firmware.