s6 boot loop,dm-verity verification failed

got s6 samsung , received in boot loop mode
tried to factory reset and wipe cache and problem persists
when entering recovery mode i see "dm-verity verification failed"
i entered phone into download mode and tried to restore and got FAILED .
any ideas ?
samsung knox is not tripped ( 0x0000 )


<ID:0/005> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> G920FXXU3DPBF_G920FDDX3DPBF_G920FXXU3DPBF_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/005> Odin engine v(ID:3.1005)..
<ID:0/005> File analysis..
<ID:0/005> SetupConnection..
<ID:0/005> Initialzation..
<ID:0/005> Get PIT for mapping..
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)