I've been given a 3gs, ios 3.1.3, baseband 05.12.01, new bootrom and have successfully jailbroken and unlocked it for my carrier. I want to upgrade to the latest possible version of ios while still preserving baseband. I've done some reading and learnt about blobs and downloaded tinyumbrella 5.10.00. I saved the SHSH, but tinyumbrella reports "12/05/2011 14:59:00.983 You have saved your iPhone3GS 4.1 (8B117) SHSH locally and the request was sent to CYDIA. This means that CYDIA DOES have your SHSH." Does this mean I can update to ios 4.1 and still preserve my baseband? wat do?