recheck info
inxi -Mxa ( check for UEFI only , not UEFI[legacy] or Bios )
test -d /sys/firmware/efi && echo efi || echo bios
in your Bios
- disable secure boot
- disable fastboot
- disks on AHCI
- no legacy
- no CSM
- UEFI only or others ( not windows )
you should see
UEFI < USB vendor name > < patrition 1 > --> boot in EFI
is ko if you get UEFI[legacy] on boot USB iso manjaro