someone more familiar with manjaro might be able to help you better...
my input would be make a minimal debian install to a different sdcard using danielt's installer. you should be able to do so from any linux machine. i suspect this will boot knowing it has the updated uboot code.
my input would be make a minimal debian install to a different sdcard using danielt's installer. you should be able to do so from any linux machine. i suspect this will boot knowing it has the updated uboot code.