If the mobile phone cannot use wireless reverse charging, please follow the following steps:
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Please check whether the wireless reverse charging switch is turned on
The phone Settings path is as follows: Settings > Battery, turn on the wireless reverse charge switch
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Please confirm whether your charging phone battery is above 20%
If the battery power of the phone is less than 20%, please use the charger to charge the phone first, and then wireless reverse charging after the battery power is higher than 20%. When the battery of the phone itself is less than 20%, the phone will automatically turn off the external wireless reverse charging to ensure the normal work of the phone itself and a good charging experience.
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Please check whether there is any foreign object between the two mobile phones
Please check whether there are other substances between the two devices, such as bus cards, metal rings, magnets, built-in metal protective shells, etc., if so, please remove them.
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Please check that the receiving device is placed in the center of the back of the charging device
The location of the charged device will affect the charging efficiency, and the farther the location is from the center, the lower the charging efficiency, even beyond the effective charging range of wireless charging.
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Please confirm whether the receiving device supports wireless charging
Whether to support the QI wireless charging protocol (it is recommended to consult the equipment manufacturer), if your equipment is not QI certification, there may be compatibility problems, it is recommended to use the wireless charger with the device to charge.
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QI certification is the WPC Wireless charging Alliance (Wireless Power Consortium) recognized authorization mark, products certified by the WPC alliance can use QI certification mark.
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Please use another receiving device that supports wireless charging
Please use other receiving devices that support wireless charging (such as Mate20 pro,iPhoneX,iPhone8\/P30 Pro) to try wireless reverse charging. If it can be charged, there may be a problem with the receiving device.
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Please try to upgrade the system version
Please confirm whether the mobile version is the latest version:
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Click Settings, enter software updates in the search box, and click Check for updates.
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If the system returns the latest version, the mobile phone system is the latest version.
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If the system displays a message indicating that the new version needs to be upgraded, upgrade your mobile phone to the latest version.
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If the above methods still cannot be solved
If the preceding methods do not solve the problem, back up your data, bring the relevant purchase vouchers, and take the mobile phone and charger to Huawei customer service center for testing.
Huawei p40 mobile phones do not support reverse charging