Galaxy N7100 ( 3 )

 Solution 1: Reset EFS via SPT (must serial Number visible)
Solution 2: Check U100 have crack (replace U100 and reballs the baseband IC UCP300)
Solution 3: try this if solution 1,2 not work. (at the picture)  
       

                                            
                                           N7100 Simcard Wayes

         
                                                                N7100 Mic Soulition