Rokit IO Pro 3D Manual page 129

The mobile phone is not in a service area
of the GSM network
The signal is weak
The charging voltage does not match the
voltage range indicated on the charger
The battery cannot
An improper charger is used
be charged
Poor contact
Move to the network operator's service area
Move to a place where the signal quality is high
Ensure the charging voltage matches the voltage range indicated on the
charger
Use the charger specially designed for the mobile phone
Ensure the charger plug is in good contact with the mobile phone
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