when i try to update my 3G the download finishes, backup completes but then it stops and says firmware corrupt. wtf??
Probably wrong but I didn't think think u could update 3G to the 4.3.1 ?? Maybe someone that has lots more knowledge about it than me will reply.
this can only be achieved IF you have saved your SHSH blobs.. i'm assuming you haven't
just do the upgrade to 4.3.1 and wait for a stable jailbreak. have fun being stock!