[Solved] fastboot set_active command does not exist

average joe Asks: fastboot set_active command does not exist
I am trying to root my Xiaom mi a2 phone. But i am stuck on changing the active partition. When i enter “fastboot set_active b” it doesnt execute the command. Instead i get a list off all available commands which doesnt contain an option to change the active partition.

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I am following this tutorial: Tutorial

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