My iPad 2 (GSM model) has been with 4.3.3 (jailbroken) for a long time, until recently there is a need for upgrade. And since I need it to be jailbroken after the upgrading, 6.1.2 seems to be the highest I can get, since 6.1.3 is not jailbreakable. (Please correct me if 6.1.3 can be jailbroken.) I started upgrading process today. After half a day's effort, of which most of the time was spent in internet research, I found myself not far away from the position before I started the upgrading process - nothing has been done and I don't know what to do. My first question is about my understanding. All the web pages I have come across suggest that I can upgrade to 6.1.2 or earlier versions only if I have a saved 4.x SHSH blob. Is my understanding correct? I *do* have saved 4.x SHSH blobs. Actually, I have saved them multiple times, for multiple versions, with multiple tools - Before today, I've saved them at least twice, each time multiple versions were saved; I've saved 4.3.3, 4.3.4 & 4.3.5; They were saved with TinyUmbrella and iSHSH*t. I also save them again today with TinyUmbrella and iFaith. So I've got 4 collections of 4.x SHSH blobs, each with multiple versions. However, there is one problem. None of the aforementioned 4.x SHSH blobs was verified valid with redsn0w (reporting "APTicket missing") and iFaith (reporting "not supported"). So I supposed that none of my blobs is valid. However, I found some web page saying "As of iOS 5, SHSH blobs require an APTicket to be valid.". So now I'm guessing that the SHSH blobs might still be valid even though neither of the two tools reports them valid. Is my understanding correct? In other words, can I use these SHSH blobs to upgrade my iPad 2 to 6.1.2 or an earlier version? My last question is about how to upgrade my device to 6.1.2 or an earlier version with blobs, assuming at least one of my 4.x blobs is valid. What tool(s) can be used and how? I tried Restore functionality of redsn0w. It was stuck at the stage that it asked me to manually get my device into DFU mode because I failed to get it into DFU mode after many times' trying. Then I gave up. Please let me know if I were on right track and I should keep trying getting the device into DFU mode. Any comment will be greatly appreciated. EDIT: Upgrading to 5.x is acceptable if 6.x is impossible. EDIT: Here is the list of my saved SHSH blobs: 4.3.3, 4.3.4, 4.3.5, 5.0b1, 5.0b2, 5.0b3, 5.1.1, 6.0gm, 6.0.1, 6.1, 6.1.2, 6.1.3TSS Center in Cydia shows: SHSH: iOS 4.3.3, 4.3.5, 5.1.1, 6.1.3 EDIT: Added question 1: Do I not have to worry about baseband? (What I have is iPad 2 GSM model.) Added question 2: I downloaded an older version of redsn0w and it managed to stitch my 5.1.1 blob with official IPSW. Can I upgrade to 5.1.1 with this IPSW and how? CONCLUSION: iPad 2 with saved 4.x and 5.1.1 blobs can be upgraded from 4.x to 5.1.1. The instructions are list here: #12.