M.2 slot is NOT a memory expansion module. There are no instructions to explain what will happen. When you first start, the operating system is installed in the M.2 slot and you are stuck. So if you want to upgrade the RAM, be sure to upgrade it before the first boot. The new ASRock NUC shows that they designed it right with hardwired storage for the OS and the M.2 slot is a true expansion slot.
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