First boot after TWRP takes 5-8 minutes. Be patient.
For J2 Core, TWRP is required to flash any custom ROM or to root via Magisk. twrp samsung j2 core
Re-enable and ensure OEM Unlocking is still toggled on (and potentially grayed out) before proceeding. Step 3: Flash TWRP via Odin First boot after TWRP takes 5-8 minutes