Flashing will erase all user data . Ensure you have backed up your photos and contacts. Flashing Steps
When the warning screen appears, press to continue. Load Files in Odin: BL: Bootloader file. AP: System/System partition (this is the largest file). CP: Modem/Radio firmware. samsung-j327t-u4-flash-file-firmware
Guide you through if that's why you are flashing. Flashing will erase all user data
Use Odin v3.13.1 or newer for compatibility with newer Samsung compression formats (.lz4). Load Files in Odin: BL: Bootloader file
You will typically get five files: BL , AP , CP , CSC , and HOME_CSC . Enter Download Mode: Power off the phone. Press and hold Volume Down + Home + Power simultaneously.
Always verify your specific model in Settings > About Phone before flashing to avoid hard-bricking your device. If you'd like, I can help you: Find the latest specific build link for your carrier.