Reason if u have 6gb/128 or 8/128 so don't update cuz oneui 6.1 and oneui 5.1 use ur device storage if u update oneui 7.0 ur device storage will out oneui 7 only for flagship if u have 4 gb 64gb so don't update it use ur all storage will runout and u can't have any storage left if u have 8/256 then update because update use more size and patch update also only if u need oneui 7 otherwise stay with oneui 6.1 oneui 7 can't give u game launcher/ game booster if u not have by default most budget phones not have
