Volume buttons dont function after update

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Android Central Question

Updated on its own which is bull**** to begin with and my volume buttons no longer do anything. How do I revert back to the previous update?
 
Updated on its own which is bull**** to begin with
It's not, actually. It costs money to maintain an older version - and you stop getting security updates, which can cost your phone in some cases. (If you get ransomware that the current version is protected against, and your phone is locked and you have to pay $X to some offshore address to get the key to unlock it ... I think you get the point.)