“Just because you can, doesn’t mean you should. If you must, use CSM and a vintage SATA drive – and keep a Linux or Windows 10 USB ready for when XP fails to boot after an update.”
After installation, you need to activate Windows XP using a valid license key. install windows xp on uefi system 2021
to boot legacy OSs like XP. If your system is "UEFI Class 3" (no CSM), you will need specialized modified ISOs or loaders like FlashBoot Pro to emulate legacy BIOS calls. SATA/AHCI Drivers: “Just because you can, doesn’t mean you should