Corebook x 1245 additional memory

Hello. Could you please help.
I have two problems:

  1. Want to upgrade memory of my corebook but after installing additional memory caught “black screen”. Without additional memory everything works fine.

Serial number - jcorbxiy3h240801623

Memory which was added kingspec 16Gb DDR4 2666MHz KingSpec SO-DIMM (KS2666D4N12016G)

What memory should work and what is the max size, which could be added?

  1. Also, after updating windows fn+space doesn’t work. All other combinations works good. How to solve this problem?

in theory what you say is right, our RAM can be DD4 16GB

@manonegra222