[Q] Optimus s unrooted

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I have the Optimus S, a few days ago there was an update to the phone that seemed to overwrite many files, as well as made changes.
It also unrooted the phone in the progress.
So when I went to re-root the phone using Z4root it hangs or fails.
Tried installing and re-installing and still fails.
When booting app Z4root it says temp root, perm root and unroot options.
Also mentions that device already has SU binary.
Any ideas on a fix for this.
Thanks for any help.