I think you misunderstand
The manjaro emmc version, IIUR, is to be written to SD, has a script that
is designed to write a copy (less script) to emmc and run a first boot setup
Better to write SD version to emmc, or blank 1st 16m of emmc with dd if=/dev/zero ........bs=1M count=16
With blank 16M emmc, the damaged uboot is gone, will use uboot on SD
The manjaro emmc version, IIUR, is to be written to SD, has a script that
is designed to write a copy (less script) to emmc and run a first boot setup
Better to write SD version to emmc, or blank 1st 16m of emmc with dd if=/dev/zero ........bs=1M count=16
With blank 16M emmc, the damaged uboot is gone, will use uboot on SD