Contains essential bootloaders (boot1), operating system cores (IOSU/CafeOS), and system tickets.
For a functioning console, "MLC download" usually refers to acquiring games, updates, or DLC to install onto the internal memory. wii u mlc download
One of the games he wanted to download was a massive game called "The Legend of Zelda: Breath of the Wild". The game was over 20 GB in size, and John was worried that it would take forever to download. Contains essential bootloaders (boot1)