Downloading and installing the correct firmware for the Samsung Galaxy J7 Nxt (SM-J701F) is the primary way to fix software issues like bootloops, frequent crashes, or to simply revert your device to its factory-original state.

: Safely return to the official Samsung Experience from custom software like LineageOS. Step 1: Pre-Download Checklist

Release the buttons when a warning screen with a yellow triangle appears.

If you want, I can:

When you extract the downloaded zip file, a fully working firmware package will typically contain five individual .tar.md5 files: