I am using IQOO NEO 9 PRO since it launched. Overall I was very happy using it. Nice performance, good battery and decent camera. 

Recently I received an update (August security patch). And immediately after update I noticed drastic battery drain in my phone. Earlier I used to get 10 hours 30 min screen on time (without gaming) but now I am getting only around 7 hours screen on time (without gaming). Please fix the battery drain issue immediately or atleast provide an option for the users to revert back to previous update. I am regretting hard for updating the phone. Please tell me how to revert to previous update. Can service centre people revert my phone to previous update? Please let me know.