Write oem file wich included in the File And Flash This Firmware In Upgrade Mode
MAR-L21MEB 10.0.0.346(C185E4R3P1)_Firmware_EMUI10.0.0_05016ACV
MAR-L21MEB 10.0.0.304(C185E4R3P1)_Firmware_EMUI10.0.0_05016LAK
MAR-L21MEB 10.0.0.168(C185E3R3P1)_Firmware_EMUI10.0.0_05016ACV
Unlock Bootloader ( Load Fastboot ) By Chimera or hcu And use This File
USE SIGMA AFTER FALSH
MAR-L21MEB 10.0.0.273(C185E3R3P1)_Firmware_EMUI10.0.0_05016RRE