E.Failed to mount /efs (invalid argument) dm verity Error...

Hello i hope everyone can help me

i buy the samsung sm-g920f from a person.
He say the telefon have a firmware problem and i think i can repair that.but now i see this telefon have many Problem and hope anyone can help me.

This Telefon Stuck on Samsung Logo.
I try it to flash original stock rom.
I try to root.
Nothing helps.

In Cwm mode read the telefon
No Support Single -sku
Supported API:3
E.Failed to mount /efs (invalid argument)
E.Failed to mount /efs (invalid argument)
E.Failed to mount /efs (invalid argument)
dm verity Error...

i dont have a efs backup i try it with efs from another s6 phone

i Try to fix that with adb/fastboot
cwm error
update from external storage is disabled
twrp sideload
adb shell error closed.

Please help me

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