| Step | Action | |------|--------| | 1 | Restart PC → Press key (F2, F12, DEL, ESC) to enter BIOS/UEFI | | 2 | Disable (if UEFI USB not detected) | | 3 | Set Boot Mode to: UEFI (for GPT) or Legacy/CSM (for MBR) | | 4 | Change Boot Order → USB or DVD as first boot device | | 5 | Save & Exit (F10) |