Disconnect the Wi-Fi antenna and display flex cables before lifting the metal mid-plane.
The phone gets stuck in a continuous boot-loop on the "Nokia" logo, or the 16GB mass memory disappears from the file manager.
A working motherboard can be repurposed. Using the "Nokia Camera Remote" app (still downloadable from archives), you can turn an N8 into a wireless viewfinder and shutter release for a modern DSLR via Bluetooth.
The motherboard hosts 256 MB of mobile DDR RAM, packaged via Package-on-Package (PoP) technology directly stacked on or adjacent to the CPU to optimize space.