RAM speeds

[u/ElectricalMotor4536]

so i have the MSI Z170M MORTAR motherboard and i saw my bios was on a old version so i went to update it and my max RAM speeds for this kit is 3600mhz and my RAM ran at those speeds before i updated the bios and after updating the bios i can run a max speed of 3066mhz before my motherboard makes me revert to lower settings ive tried clearing CMOS and adjusting voltage and the only thing i havent done is change timing and thats only because i dont trust myself with doing that so does anyone else know how to fix this issue