Step-by-step – Build Kernel CentOS 9 Guide

Installing

7. 7. Installing Kernel

   Finally, to Install CentOS Linux Custom Kernel
   Simply play:

   sudo su -c "dnf install /root/rpmbuild/RPMS/x86_64/kernel*.rpm"

   And this setup includes also the Custom Kernel Headers that you don’t will find online. :)

   

   And finally reboot with:

   sudo reboot

   Finally, you should boot into your barely new CentOS Linux Kernel :)
   To check it run:

   uname -r

   And in case of Issue you still can choose the previous one on the GRUB Splash Screen!

8. 8. Updating Firmware

   How to Update Linux Devices Firmware on GNU/Linux

   Updating Firmware Guide

   How to Install Linux Git Firmware on GNU/Linux

   Especially relevant: this setup is optional and may be required only to make use of some New Device Drivers not available in your current Firmware.