I just bought a used iPad 1, which currently has 4.2.1 on it. *I try to use tinyumberlla to back up the shsh, but it fail. *It looks like it wasn't previously jailbroken and thus no shsh on cydia. What are my options for jb now? - is greenpoison my only option to jb 4.2.1? - and then I have to stay at 4.2.1 (cannot update, until 4.3.2 jb comes out)? Any suggestions will be greatly appreciated. Thanks in advance.