Troubleshooting
148
98
Message type not compatible with the protocol state
99
Information element non-existent or not implemented
100
Conditional IE error
101
Message not compatible with the protocol state
111
Protocol error, unspecified
133
Error unknown
138
Lower layer failure
150
T3410 timeout
151
T3420 timeout
153
T3418 timeout
256
NAS EMM not registered
257
Service loss
Other value
Protocol error, unspecified
LCD Is Dark
The following table describes situations that can cause the LCD to be dark (that is, not
displaying any text or icons), and recommends actions.
Device state
LCD state
Your action
On
Off (
Advanced
settings > Device > Display >
LCD Backlight
is set to “Off”)
Turn on the LCD: set
LCD Backlight
to
“On.”
On
On, but dormant (inactivity
timeout)
Briefly press the power button
on
the device.
Off
Off
Turn the device on:
Make sure a battery is inserted into the
device.
Press the power button
on the
device until the device turns on.
If the LCD is still dark, use the micro-USB cable to connect the device to the AC charger or to a
computer.
Insufficient Signal Strength
If you have insufficient signal strength, an icon is displayed on the left side of the home page.
Insufficient signal strength, indicated by
, may occur because: