STK Professional Audio EVO 2 User Manual & Setup Manual page 37

The SIM card is
The mobile
phone
cannot
The mobile phone is
connect the
not in a service area
network
of the GSM network
The signal is weak
The charging voltage
does not match the
indicated on the
The battery
cannot be
An improper charger
charged
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Go to STK live chat on our website
someone there to help rescue you.
invalid
voltage range
charger
is used
Poor contact
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STK EVO 2 | User Manual & Set up Guide
Contact your network service provider
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
Ensure the charger plug is in good contact with the
mobile phone
or via Care App, there is always
phone
37