Ha, that's really weird. I have read this command from another device sub-forum.How did you do that ? My ADB dosen't recognize this command : cmd package install
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I am with the plain Mate 20, but there's no sense not to work on Mate 20 X.
https://forum.xda-developers.com/member.php?u=1397125
I found this guy with Mate 20 X and the cmd command is working for him: https://forum.xda-developers.com/showpost.php?p=78871776&postcount=2
Edit: Oh, I see... maybe it's because you have the Chinese version.