Do I need an UEFI-bootable USB to install UEFI-bootable Arch?

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https://bbs.archlinux.org – This isn't totally true.  It would certianly be easier to get UEFI working by initially booting ito some Linux UEFI environment.  But you could also just put the boot manager or bootloader at \EFI\boot\bootx64.efi and configure it.  Then set the system to boot UEFI and choose the drive that has this ESP, and it will take you into that bootloader.  So assuming it is then configured correctly to boot your Linux, you're good to go.What UEFI is required for is to have the necessary /sys directories avialable in the running system to create efibootmgr entries.  Th (HowTos)