STK-L21 10.0.0.476(C185E7R5P1)_Firmware
STK-L21 10.0.0.207(C185E3R6P1)_Firmware_EMUI10.0.0_05015VQH File By (Gbfirmware.Com)
STK-L21 10.0.0.305(C185E6R6P1)_Firmware_EMUI10.0.0_05016GNM File By (GBfirmwareCom)
STK-L21MDV 10.0.0.274(C185E3R3P1)_Firmware_EMUI10.0.0_05016NWE