If you're experiencing issues with booting after a CPU microcode update on an AMD system, it's important to take the following steps to troubleshoot and potentially resolve the issue:

1. Enter BIOS/UEFI Setup:

   • Restart your computer and enter the BIOS/UEFI setup.
   • Look for an option related to CPU microcode updates or CPU settings. This option might be named differently depending on your motherboard manufacturer.

2. Disable Microcode Updates:

   • If you can find an option related to microcode updates, try disabling it. This will revert to the previous microcode version.

3. Clear CMOS/Reset BIOS Settings:

   • If disabling microcode updates doesn't work, you can try clearing the CMOS memory or resetting the BIOS settings to their default values. Refer to your motherboard manual for instructions on how to do this.

4. Update BIOS/UEFI Firmware:

   • Check if there is a newer version of the BIOS/UEFI firmware available for your motherboard. Updating the firmware may provide better compatibility with the new microcode.

5. Roll Back Microcode Update:

   • Some motherboards allow you to manually roll back the microcode to a previous version. Check your motherboard's documentation or support resources for instructions on how to do this.

6. Contact Motherboard Manufacturer Support:

   • If none of the above steps work, consider reaching out to your motherboard manufacturer's support team for guidance. They may have specific recommendations or firmware updates available to address this issue.

7. Consult AMD Support:

   • Visit the AMD website or contact AMD support for information on any known issues or solutions related to microcode updates for your specific CPU model.

8. Consider Professional Assistance:

   • If you're not comfortable making changes to BIOS settings or firmware updates, consider seeking assistance from a professional technician or contacting your computer manufacturer's support.

Remember to proceed with caution when making changes to BIOS/UEFI settings, as incorrect settings can potentially cause further issues. Always follow the manufacturer's instructions and documentation.