Good news. 
With the support of @narmstrong , it was possible to get a working version of u-boot-2018 for all models of VIM2 (S912). I checked on the VIM2 Basic and Max, u-boot-2018 works with SD card and eMMC. This will allow you to use Linux in normal disk mode with the latest version of u-boot on all VIM2. For those who want to try the new u-boot-2018, I uploaded two files to the site, for VIM and VIM2.
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