This blog exists solely to publicize the MD5 for the tool that I wrote for obtaining and saving your iPhone 3.1 shsh blobs. The tool simply performs the same challenge request that itunes does during an iphone 3gs restore. The difference is that I save the results in a single shsh file. This file will give you the ability, when used in conjunction to another tool I have, to restore back to 3.1 indefinitely -- Provided you stay at itunes 9. UPDATE: I would recommend grabbing your shsh files again but even if you don't it doesn't matter. When TinyTSS is released, it will handle the 3 shsh files. Keep checking back for the TinyTSS release! Since I released the source I expect some vultures to try and profit off of this. I expressly forbid it. Nothing I did was profound but I release the code under GPL. NOTE: I have combined Umbrella and TinyTSS into a single download! You can download it from the link posted in the TinyTSS release post! If you need an md5 checker I like: Nirsoft's MD5 Checker Have fun. And please beware of imposters. CHECK THE MD5/SHA1 OF THE ARCHIVE! Note: If you have saurik's server in your /etc/hosts or %WINDOWS%/system32/drivers/etc/hosts file you will need to remove it as I do _NOT_ want people spamming his servers unnecessarily. PS. umbrella64 REQUIRES that you have a 64bit jvm installed... dont use it if you have no idea what that means. After much weeping and wailing and gnashing-of-teeth: The 3gs' chipid is 0x8920