Blu STUDIO 5.0 CE - Insert SIM

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INSERT SIM REPAIR PROCESS
NO
Replace SIM card
MT6572 may be
defective
Insert SIM
Clean or replace
SIM connector.
Clean or re-weld the
SIM connector
Check SIM connector
is OK or not
Re-solder or
replace CPU
MT6572
OK
Check if all the SIM
pins are clean
NO
Check FPC on SIM
connector is OK or not
NO
Replace FPC
NO
Upgrade software can
settle the defect issue?
NO