Honor 7 Problems

Hello guys, does anybody here using Honor 7? Did you update it to Android 6.0 Marshmallow (EMUI 4.0)? Then did you have any experience with the quick battery draining? It's very frustasting Before I update to EMUI 4.0 the battery is work for a long hour. Please tell me how I'm gonna rollback to EMUI 3.1? Thanks.

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