Factory reset

If you're getting battery drain, app crashes after a major update it's recommended to do factory reset. Otherwise no need for full reset just clearing cache files enough.

No no factory reset is not mandatory after every os update. Wipe cache partition is mandatory. If u want u can do factory reset but it is not mandatory



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In simple words only if you face any problem after upgrading Android 12 like overheating,battery drain issue, performance issue,or any other!
If you factory reset your phone please do a step that wipe cache data partition