My Axon 7 mini is supposed to be a dual-sim device. But it has only one IMEI for the slot 1 and it does not recognize the sim card in slot 2. And the device settings does not have the Dual-sim settings. The build number is ZTE B2017G_BELLV1.0.0B06, the hardware number is P852A15HWV1.0 and the baseband version is P852A15H01. Can you find a solution to get both sim slots to work? Thanks.