Problem with hardware reserved

[RRR]

I have a problem with my asus x570dd
2.1G of my ram is not usable because of hatdware reserved
I had try man solutions and none of them help me
Like:1-msconfig2-regedit-3updating bios and etc
And my bios hasnt chipset setting for other solutions
What should i do?

[RAJU_MSC_MATHEM]

sorry , i dont have any further ideas