Saving your SHSH blobs is the single most important thing you can do to preserve your jailbreak. If you ever accidentally upgraded to a new version of iOS that hasn’t been jailbroken yet, saved SHSH blobs would help you downgrade.
The new version of TinyUmbrella is out (version 5.00.77), and not only does it allow you to save your SHSH blobs for the new 4.3.5 firmware, it also gives you the choice of whether or not to update your iPhone 4′s baseband…
The new feature will enable users to pick whether or not they want to update the iPhone 4′s baseband, allowing you to mix and match a new baseband with an older version of iOS. But the new option doesn’t come without a few warnings:
1. The version you WANT to restore to and the version Apple is currently signing must BOTH have the same baseband. This is important or else the baseband update will not work.
2. You need to realize that checking the box WILL UPDATE YOUR BASEBAND.
Notcom also comments that TinyUmbrella doesn’t save your Update iPhone 4 Baseband setting, so you need to make sure you are checking it every time you run TinyUmbrella. Obviously, if your iPhone is unlocked on an earlier baseband, you want to stay away from this feature.
If you are still confused as to why you need to save your SHSH blobs to downgrade, click here for our ultimate downgrade guide. Otherwise, you can grab the latest version of TinyUmbrella by clicking here.