iMac 27-Inch Mid 2017
To open the Mac you cut the tape holding the screen down as Apple decided to glue the screen in...
The ROM is a WSON-8 chip 5x6mm (64Mbit Winbond 25Q64).
The ROM in on the top (easy to reach) side of the motherboard.
The SPI connector is a Hirose-12 but is not mounted by Apple.
The board number is bottom right corner of the board, just above the SD card slot.
Medusa: Mount SPI connector. Use A4160 with arrow to right (direction of SD card slot). Reading works on loose motherboard.
Blank ROM chips and SPI connectors are available from us.