Amazing Khadas, always amazes you!
VIM1S has an onboard eMMC, so you can install the OS into the eMMC.
VIM1S comes with the OOWOW1) embedded service, you can use OOWOW to install your preferred OS directly from the Cloud.
It is the easiest way to install OS.
Please check VIM1S Install OS into eMMC via OOWOW.
Please check VIM1S Install OS into eMMC via USB Flash Tool.
VIM1S also supports to boot from external storage, e.g.
USB storage, etc.
Please check Install OS into External Storage.