There are usually three reasons for this:
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1, is the problem of the charging data line, the frequent use of the charging data line is the most prone to problems.
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2, the charger is the problem, the charger interface contact is poor or part of the circuit is damaged, then it is not able to enter the fast charge mode.
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3, that is, the charging line of the phone itself is faulty. In short, these three reasons are the reasons why the phone can not enter the fast charging mode.