After system update on chinese huawei honor 9 ac battery drains in a day, what can be done?

Answer from: Julia Shishkina:
📚Librarian is a very ancient profession, it is more than four and a half thousand...

Try to turn off all unnecessary applications, deactivate the second sim card if you do not use it. Use 3G or 2G instead of 4G, reduce the brightness of the screen. If you are not satisfied with these recommendations and you want to return everything back to the way it was, then you have to find the old firmware and reflash your phone

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