1. In the Settings screen of your Huawei phone, find the battery option and tap it.
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2. In the battery screen, find the wireless reverse charging option and turn on the slider on the right side of it.
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3. After opening the slider, click on the bottom to know, you can stick to the back of the phone to charge.
Huawei p40 mobile phone wireless charging does not need to be set, as long as the phone is placed on the wireless charger, you can charge yourself.
This does not need to be set by yourself, is automatically opened by default, and can not be closed