In this video, I upgrade a Mid-2012 MacBook Air from 4GB to 16GB of system memory, and in the process repairing the machine, which I got with bad RAM. Since this machine never came from the factory with more than 8GB of RAM installed, modifying the SPD, or serial presence detect, info in the system's SPI ROM was necessary in order for it to detect and run with the newly-installed memory.

If you'd like to contact me about performing an upgrade such as this, go to https://doslabelectronics.com/contact

A copy of the SPD dump used can be found here: http://dosdude1.com/files/spd/PC3-128...
Stencil kit used: https://www.unionrepair.com/ds-908-ma...