If your Huawei mobile phone cannot be fast charged after the Hongmeng 4.0 upgrade, the possible causes are as follows:
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It may be due to incompatibility of charging head or charging cable, it is recommended that you use the original charging device.
It may be due to the upgrade of Hongmeng 4.0, the mobile phone battery may be affected, resulting in slower charging speed.
It may be due to dust or dirt on the charging port, it is recommended that you use a soft brush or cotton swab to clean the charging port.
If the preceding methods fail, send the mobile phone to Huawei service center for check and repair.
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I hope the above information can help you solve the problem. If you have any other questions, please feel free to let me know.