If you convert a Manjaro ISO using MPI_FAT32 (MakePartImage) the resulting .imgPTN will not MBR or UEFI boot.
The grub2 EFI boot file included with Manjaro, only seems to support the CD iso9660 file system and does not understand FAT32 filesystems.
If you use Rufus, you must use the 'dd' raw copy option and not the UEFI FAT32 or GPT options.
To fix this, find a Ubuntu or Mint x64 Live CD ISO file, and...
1. Switch the Manjaro.imgPTN file on the E2B USB drive so that the \EFI\BOOT folder is visible in Explorer.
2. Use 7Zip or some other program to extract the two EFI\BOOT\*.EFI files from the
Ubuntu ISO.
3. Copy the two files into the \EFI\BOOT folder on the E2B drive.
4. For CSM Legacy booting, add these 4 lines to the end of the \menu.lst file (see \boot\grub\tz and the \boot\grub\locales\keyboards file for your country codes - e.g. en_US New_York us).
title Manjaro x64\n Manjaro Live
kernel /boot/vmlinuz-x86_64 misobasedir=manjaro misolabel=EASY2BOOT systemd.show_status=1 lang=en_GB tz=London keytable=gb
initrd /boot/amd_ucode.img /boot/intel_ucode.img /boot/initramfs-x86_64.img
boot