Question ASUS TUF RAM availability issue

Aug 30, 2019
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hi guys, i recently bought an Asus TUF FX505DT-AL106T. I saw in reviews that only 5.8GB ram is available out of 8GB but upgrading bios fixes the problem so i went on with it and bought it.
I proceeded with the bios update but it didn't fix the problem for me.
I read at some places that 2GB is reserved for IGPU but i cant find any legitimate source.
Can u guys help me fix the problem?