It is advisable to add description of reset commands ENV in the default state to the page with the description of the update for the boot loader.
http://docs.khadas.com/develop/UBootUsage/
These commands are different from the previous cases that are used in the documentation for the official Amlogic buildroot. By the way, I checked the updated boot loader (built-in function multi-boot) on the branches of Vim and ubuntu. Everything works. If these changes to include in the regular version of u-boot images, users do not have to activate, it will work immediately after turning on VIM. It’s up to you, if you want, I can put a request for inclusion in main branch.
Test options ready binary files, you can get here.
https://yadi.sk/d/gRJa9jXd3FgUBi