Before reinstalling the lower 5G mmWave antenna, replace the bracket with a new one. If you don't have a new bracket, skip this step.

Remove the antenna and connector from the old bracket.

Remove the L-shaped adhesive liner from your new bracket.

Place the antenna in the bracket's recess with the connector fed underneath the longer screw mount.

Remove the thin adhesive liner on the outside of the bracket before installing it in the frame.