All Fragmented Serial Number Locations in MIO: Memories in Orbit

From the Network gate, drop down and head east.

Make your way to the bottom of the laser-filled room and then head through the vent to the west.

After taking the elevator down, head all the way east to find it at the end on the metal floor.

At the bottom of the shaft in the hidden path.

Found at the end of the hidden vent in the corridor above, beneath the rising platform. You can see this from the western redacted area, on the other side.

Found at the end of the hidden path through the nearby vent.