Samsung Galaxy Core Prime SM-G361F Problem

Hello,
I have a big problem with my Samsung Galaxy Core Prime ( SM- G361F )
when I started normally stuck on the Samsung logo.
I can start it in Download Mode ; so I tried to flash ROM several Custom Stock is but nothing happens ,
when do I start it in Recovery Mode : The recovery starts normally except I 2 errors :
E : failed to mount / efs ( Invalid argument )
E : failed to mount / efs ( Invalid argument )
....
vraimant I need help ...
Thank you in advance

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