如何启动装在SSD里的manjaro。(How to boot Manjaro in SSD instead of Ubuntu in emmc?)

我在emmc里安装了 VIM3_Ubuntu-gnome-focal_Linux-4.9_arm64_EMMC_V1.0.7-210625,然后用etcher将 Manjaro-ARM-kde-plasma-vim3-20.12.img.xz烧录到SSD里,请问如何操作让我可以选择启动的系统?

it is almost a year old.

Please use Krescue for this.