Write oem file wich included in the File And Flash This Firmware In Upgrade Mode
after flash follow this (https://www.youtube.com/watch?v=F5ZDzoW-6ow)
Stark-L23BX 9.1.0.303(C605E1R2P2)_Firmware_9.0.0_r3_EMUI9.1.0_05015WMC
Stark-L23BX 9.1.0.286(C605E1R2P2)_Firmware_9.0.0_r3_EMUI9.1.0_05015WHF