Experts Help Me

All respective experts please help me to solve out my problem.I have a Sam j810g dead isue i cheked phone and found emmc are corrupted. i backup emmc by 512 mb first boot second 4 mb and third 4 mb and also read by vendor.I replace emmc by same ic and flash it by write by All rom and write by vendor also but handset was not going to on.pc detected as qualcom. please help me where i am faulty please explain and what is the full proccedure Thanks in Advance.

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