Mi 11 data line charging does not show 55W fast charge slow charge, you can try the following methods to solve:
Check the charging head and data cable: If there is a problem with the charging head or data cable, it may affect the charging speed. You can try to replace other charging head and data cable for charging to determine whether it is a problem with the charging head or data cable.
Restart the phone: Sometimes the phone may have some minor problems, you can try to restart the phone to solve.
Check the charging interface: If there is dust or foreign matter in the charging interface, the charging speed may be affected. You can wipe the charging interface with a clean cloth to keep the charging interface clean.
Update the system: If there is a problem with the phone system, it may affect the charging speed. You can try to update the phone system to solve it.
Contact the after-sales service: If the above methods can not solve the problem, it is recommended to contact the official after-sales service of Xiaomi and seek the help of professionals.