A couple of weeks ago, Apple released a tweaked build of iOS 5.0.1 (9A406) exclusively for the iPhone 4S in order to address the "Invalid SIM" or "No SIM Card installed" issue that a few 4S users have been experiencing. In line with that, popular SHSH solution for the iOS, TinyUmbrella, has been updated in order to work with the tweaked build of iOS 5.0.1.
This basically means that 4S users who were able to update to the second release of iOS 5.0.1 (9A406) will now be able save the firmware's SHSH blobs and we highly recommend that you do it as soon as you can. Why? We just reported yesterday pod2g is now making progress with his iOS 5.0.1 untethered jailbreak for A5 which could come out as early as next week, which means that iPhone 4S and iPad 2 users would finally be able to jailbreak their devices on iOS 5.0.1.
Since there is no bootrom exploit for A5 devices, owners of such devices will not be able to utilize tools like iFaith and Redsn0w in order to create custom IPSWs and use them to restore but still, it is always a good idea to save your SHSH blobs. For iPhone 4S users who are still on iOS 5.0, we HIGHLY RECOMMEND that you update to iOS 5.0.1 now if you want to grab the A5 untethered jailbreak once its ready for primetime. Do it right away before Apple decides to release a new firmware update and stops signing iOS 5.0.1, which will effectively stop you from updating to that firmware and you will miss the untethered jailbreak.