Please add your suggestions to improve the documentation for the Xiaomi - Mi MIX 2S - polaris here …
It may be worth mentioning the option of separate firmware/vendor update as preparation to moving to a new major release. There is a well-known open-sourced PROJECT that extracts these components from the official Xiaomi’s ROMs to make such an update possible.
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Actually, this applies to any Xiaomi device that may require flashing of the latest official MIUI before upgrading eOS.