Grub bootloader broken

you boot on USB iso manjaro
open a terminal

before chroot

inxi -Mza ( check this is UEFI only ) 
sudo efibootmgr -v
test -d /sys/firmware/efi && echo efi || echo bios

if ok

sudo manjaro-chroot -a 
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck --verbose 
mkinitcpio -P
update-grub
efibootmgr -v
exit ( quit chroot )

then reboot

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