TinyUmbrella has been updated now the SHSH Blobs program has reached the 5.10.00 version. Most of you must already know what this tool is good for. Therefore to make the post short. You are welcomed to download TinyUmbrella 5.10.00 for Windows and Mac and save the new iOS 5.1 Beta 1 firmware SHSH Blobs for future downgrade.
Here is the download links of TinyUmbrella 5.10.00 based on your operating systems: