Manjaro uses UEFI firmware by default.
Manjaro uses UEFI firmware by default.
You're encountering a grub unknown filesystem error after installing Manjaro via Rufus. This usually happens when the USB drive isn't properly formatted or recognized by UEFI. Try formatting the drive with a different tool like GParted or checking for any corruption before proceeding.
Try Fedora’s utility—it supports writing any ISO to a USB drive, not limited to Fedora alone. Click the provided link. Choose “custom image,” pick your desired ISO, and select your USB stick. It will install in UEFI mode by default.