[Q] (Challenge) Flashing bootleg phones!

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http://forum.xda-developers.com – i got a friend im trying to help. Is there a way that I could get a GS4 to work some way, or accept a sim. let me explain.... He bought it from some dude selling them. someone he know pulled his and showed it was boot leg. it didnt even have the flap to close over the phone. the instructions look like they were printed at someones house. there was no sim card and i tiok it home and tried 2 prepaid old sim cards i had at home. one said invalid sim (att) and other (no name) said umlisted or un registered sim. i checked the meid or esn number and it said it was discontinued or something t (HowTos)