Ensure "Re-partition" is NOT ticked in the Options tab. Click the Start button.
Power off your phone. Press and hold Volume Down + Home + Power buttons simultaneously to enter Download Mode.
If you receive a "SW REV CHECK FAIL" error, it means you are attempting to flash a lower binary firmware on a higher U5 version. If you can share: samsung-j327a-u5-flash-file-firmware
Click on and select the CSC file (Use CSC_*** if you want to clean wipe, or HOME_CSC_*** if you want to keep data).
Look for "SM-J327A U5 Firmware" (Ensure it is U5/5). Ensure "Re-partition" is NOT ticked in the Options tab
If you are flashing to remove a Google lock, you may need the combination firmware to enable USB debugging, followed by flashing the stock firmware, or use a tool to bypass it.
Download the latest version of Odin (v3.10.7 or newer recommended). Press and hold Volume Down + Home +
What are you trying to fix (bootloop, FRP lock, software update)? What error message are you seeing in Odin (if any)? I can help troubleshoot the flashing process.