I have to return a phone that was previously rooted. I unrooted by flashing the PBIMG file. Now I have a stock rom but I still have S-OFF. I downloaded the S-ON zip file but when I go to Recovery, all I get is an icon of the phone with a red triangle on it. How can I flash the S-ON? Do I need to Re-root then S-on? If so, could I still reflash the stock rom? What is the proper sequence. Did I lose the recovery module when I went back to stock? I would appreciate any help please.