Earlier we told you that saving SHSH blobs of iOS 5 is not possible for now. That means when a new firmware arrives like iOS 5.0.1, you can not be downgrade from iOS 5.0.1 to iOS 5. Now we are saying that Notcom, the developer behind TinyUmbrella has updated his tool for iOS 5.0.1. Just read the following paragraph by the developer and it will make sense:
Even though there is still no working solution for restoring 5.x on iPhone 4S I have released a 5.01.00 so you can at least save 5.0.1 SHSH. I have added tentative support for at least saving 5.0.1 SHSHs for iPhone 4S but as of now we are unable to use them fully.
As soon as more information is available I will update.
Now that you know its just a tentative support for at least saving SHSH blobs and restoring to it is still not possible. Although you can downgrade from iOS 5 back to firmware versions of iOS 4 like iOS 4.3.3.