The upper 5G mmWave antenna is lightly adhered to the motherboard.

Pry up and disconnect the upper 5G mmWave antenna cable from the motherboard.

Use tweezers, or your fingers, to remove the upper 5G antenna.

Set the antenna aside. You'll reuse it during reassembly.

During reassembly, reconnect the antenna connector first to properly align it into place, then firmly press the rest of the antenna module down to adhere it.