FLY ds115 plus Service Manual page 27

4.3 Can not recognize SIM
Heat or change
U0100
FLY SERVICE SUPPORT
Can not recognize SIM
yes
The SIM connector
appearance ok?
yes
The resistance to ground
no
of SIM pins ok?
yes
Change U0100
The SIM connector
no
damaged? SIM pins dirty
or distortion?
Change SIM connector
27
yes