Tecno BB4K (32+2v) After Flash dead & Display Line Solution

Hi Forum Expert
Tecno BB4K (32+2v) After Flash dead & Display Line Solution Need

I NEED tested file and tool

Im Try sum file but same isu

KC1-H6114A-P-190731V165_spark_go_ROMProvider.COM
BB4k-H6114UVW-PGo-200112V66_By Flashfile.in
Tecno_Spark_4_Lite_BB4K_MT6761_V76_200212
Tecno_Spark_Go_KC1_MT6761_V459_201021_(by_naijarom .com)

Flsh tool
Softwaredownload_V5.1907.04.15_for_AfterSales

I NEED tested file and tool Thanks in advance