Yeah, now that the official 596 is out, the 588 is what I was referring to. Most of us went to every leak that came out including the 588 so we got the updated baseband. (in the 588)
tgadd it is possible to get bad files sometimes. So I would go with your gut and redownload them if you think they were corrupted somehow. If you never updated to the 588 then you are doing the steps you need to. (SBF back to stock, flash TBH two file GB update).