Zte MF645 User Manual page 52

Problem Description
The Modem cannot
connect to the Internet
in other places
No warning tone
My MicroSD card can
not read or not found
Possible Causes
3. The operating system
is infected by virus (Such
as Worm Blaster which
can take up a quantity of
upload data flow and
result that it can't receive
downloaded data flow so
that you cannot open
any website.)
4. You have connected
to other APN. which
cannot connect to the
Internet.
Your USB Modem is not
permitted to roam in your
network.
No audio card is fixed in
computer or the volume
is too small.
Check the MicroSD card
capacity, the maximum
supported capacity is 8
GB.
52
Problem Solving
3. Use the professional
anti-virus software to
check and kill the virus in
the operating system
completely.
4. Consult the shop or
ZTE.
Connect with the shop or
ZTE.
Check the audio card
and adjust the volume
properly.
Use another MicroSD
card with a maximum
capacity of 8 GB.