vi /etc/fstab
-grub-install --removable /dev/nvme0n1p4
+# We deinstall grub-efi-arm64-signed- because it creates a file fbaa64.efi
+# which makes u-boot hang.
+apt-get install grub-efi grub-efi-arm64-signed-
+grub-install --target=arm64-efi --efi-directory=/boot/efi --removable
+# Set removable media to yes and nvram to no to make later grub updates work
dpkg-reconfigure grub-efi-arm64
update-initramfs -k all -c