Weekly Build 13 ISO Fails to mount /boot/efi

The Stable release was a several hour battle with bootx64.efi but you guys did amazing work with the EFI support in the new weekly build. Even the issue with detecting the cdrom was fixed.

However, I am now stuck here:

Code:

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The attempt to mount a file system with type vfat in SCSl1 (0,0,0), partition #1 (sda) at /boot/efi failed.

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I'm on a toshiba satellite using weekly build iso 13. Does anyone have any tips?

What filesystem does your bootable USB have? vfat? Isn't FAT 32 common to use?

mount | grep "^/dev" is showing vfat. I used rufus to mount the iso to USB.

Make it FAT 32.