how to access service mode

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BnVon

New member
Nov 16, 2013
4
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Hey guy ! Im using SS galaxy grand duos on 4.2.2 stock rom. My problem is I can't access in to service mode I have tried *#197328640# but nothing apear. Is there anything to set ? Please help:crying: ps.4.2.2 stock rom Thailand:good:
 

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