Unlock Bootloader ( Load Fastboot ) By Chimera or hcu And use This File
MAR-L03BX 10.0.0.251(C212E6R1P1)_Firmware_EMUI10.0.0_05016CYM
MAR-L03BX 10.0.0.248(C69E7R1P1)_Firmware_EMUI10.0.0_05016CYN
MAR-L03BX 10.0.0.188(C605E5R1P1)_Firmware_EMUI10.0.0_05016CXF