How to downgrade and remove istiod and promtheus from previous upgrade?

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I was able to upgrade from 1.4.3 -> 1.4.10 -> 1.5.8 -> 1.6.4. I could not have done it without help from Istio community (Prune and Vito).

Check this link - Upgrading istio 1.4.3 to 1.6.0