Hello, I have a Sony Xperia Z5 Premium Dual Sim model E6883 and firmware E6883_32.4.A.1.54_1302-9579_R3E.The problem I have is that it does not work on GSM in any of the SIM1 or SIM2, I have checked my Sim Card in another mobile and if it works correctly in GSM, in LTE and in 3G works perfectly...