MacBook Pro F-Key 13-Inch
To open the Mac you need a P5/PL4 Pentalobe screwdriver.
The motherboard number is on the top (easy to reach) side, on the right-middle of the board between the WiFi cables and the SSD.
The ROM is a WSON chip (64Mbit).
To read or write the ROM use Medusa with A4160 (red) EasyFlash adapter (arrow points to the front of the Mac, i.e. to the battery).
Battery flex: 821-00614
Battery connector on MB: FF18-10A
Connector on battery: FF18-6A