I purchased x86j4105 products. (emmc + pre-installed windows 10)
I removed Windows 10 on emmc
Instead, I installed Windows on sata ssd.
However, it was not automatically authenticated as expected,
I reinstalled to emmc using the backup image in wiki.
After that, I checked whether it was certified or not, and it said that it could not be certified.
The simplest way to reinstall Windows 10 is through Windows itself. Click ‘Start > Settings > Update & security > Recovery’ and then choose ‘Get started’ under ‘Reset this PC’ . A full reinstall wipes your entire drive, so select ‘Remove everything’ to ensure a clean reinstall is performed.