Use the latest version of Odin to flash files.
The can be rooted primarily by flashing a custom recovery like TWRP or using a pre-patched root kernel file through Odin . Because the J2 Core is a "Go Edition" device, rooting it often requires files specific to its Binary/Bit version (e.g., U7, U8, or BIT 9) to avoid "FRP Lock" or "Custom Binary Block" errors. Essential Pre-Root Checklist j260f root file