This is my first time building a pc and I need to update my bios to install windows 10 I have a z390 aorus pro but I cant seem to figure out how to update to a newer bios
I assume you want to replace the current microprocessor on your motherboard with another microprocessor. I also assume that your motherboard is from GIGABYTE. First you need to go to your motherboard's manufacturer website to see if the microprocessor you want to replace your current one with is compatible with your motherboard. Then you have to check with the motherboard's manufacturer website to see which version of BIOS you need to work with the new microprocessor. Then just follow the correct steps to flash your motherboard's BIOS/UEFI. You can try to learn from YouTube videos too.
GIGABYTE website that shows the steps to flash BIOS: https://www.gigabyte.com/FileUpload/global/WebPage/20/HowToReflashBIOS.html
GIGABYTE motherboard CPU support list: https://www.gigabyte.com/Support/CPU-Support