Write oem file wich included in the File And Flash This Firmware In Upgrade Mode
STK-L21DHNVX 10.0.0.264(C10E4R1P1)_Firmware_EMUI10.0.0_05016GKN
STK-L21DHNVX 10.0.0.254(C431E5R1P1)_Firmware_EMUI10.0.0_05016HCK
STK-L21DHNVX 10.0.0.252(C431E3R1P1)_Firmware_EMUI10.0.0_05016HCK
STK-L21DHNVX 10.0.0.239(C10E4R1P1)_Firmware_EMUI10.0.0_05016SLA
STK-L21DHNVX 10.0.0.232(C10E3R1P1)_Firmware_EMUI10.0.0_05016SLA
STK-L21DHNVX 10.0.0.223(C10E3R1P1)_Firmware_EMUI10.0.0_05016SLA
STK-L21DHNVX 10.0.0.218(C10E3R1P1)_Firmware_EMUI10.0.0_05016SLA
STK-L21DHNVX 10.0.0.210(C10E3R1P1)_Firmware_EMUI10.0.0_05016SLA