Hi, If you have Linux working on an SD card, Then I think you can do this…
From the Linux on the SD card,
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download and unzip the latest version of Android from here: https://dl.khadas.com/Firmware/VIM3/Android/VIM3_Pie_V200624.7z
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Identify the eMMC storage location (like dev/sda5… )
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Burn the image to the eMMC with the DD command,
and now if reboot the device from eMMC, Android should work…
Any Linux wiz can verify my method…
@Numbqq, @Frank do you guys agree ?
Alternatively, You can use Krescue I guess…