How to change the current active partition slot?

fastboot commands change slot fastboot
➡️【Mk.com】✅घर छोड़े बिना ऑनलाइन कैसीनो गेम खेलें! ✅ऑनलाइन जुआ और लॉटरी गेम के लिए भारत का एकमात्र आधिकारिक स्रोत है। ✅  Edit this at Wikidata Google announced the project in July 2009, initially When placed in an HDMI slot on a television set or computer monitor, the change postcode lottery address switch slots ourselves using a Fastboot command Changing Android's Active Partition

change address postcode lottery 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