For a "free" or "auto" patch on Binary 7 (U7), you typically need: : SM-J530S (Galaxy J5 Pro South Korea variant).
: This process involves flashing a modified or Global Firmware onto a single-SIM hardware device. While it adds the software interface for a second SIM, you may still need a physical dual-SIM tray or internal hardware modification to use two physical cards. j530s u7 dual sim auto patch free