Like a zillion people, I'll be upgrading to (what I assume will be) iPhone 4S this month. In the meantime, I'll be upgrading my iPhone 4 to iOS 5 when it is released, hopefully this Tuesday. But I want to be able to sell my iPhone 4 in a 4.3.5 state in case my buyer wants to jailbreak/unlock it. So do I need to use Tiny Umbrella to save my SHSH blobs before the iOS update? Do I need to worry about the possibility of a baseband update? Is it likely that I simply won't be able to get back to an unlockable 4.3.5? Should I not even worry about it and have faith that a jailbreak for iOS 5 will come along quickly?