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3.18 No SIM
Teardown check the connection condition of
RF antenna, can reassemble the general card
Check the transceiver IC, PA and surrounding
devices welding is good
No SIM
Replace a new SIM card
N
Check
whether
write
number and the IMEI number
Y
N
N
Replace Modem Chip
Y
OK
N
SN
Rewrite SN number and
the IMEI number
Y
Y
OK
OK
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