NAND Write Start!! FAIL! Complete(Write)0>0>0>

Please help me i was trying to downgrade my samsung galaxy s6 edge (g925f) but odin says
<ID:0/004> Added!!
<ID:0/004> Odin engine v(ID:3.1101)..
<ID:0/004> File analysis..
<ID:0/004> SetupConnection..
<ID:0/004> Initialzation..
<ID:0/004> Set PIT file..
<ID:0/004> DO NOT TURN OFF TARGET!!
<ID:0/004> Get PIT for mapping..
<ID:0/004> Firmware update start..
<ID:0/004> SingleDownload.
<ID:0/004> sboot.bin
<ID:0/004> NAND Write Start!!
<ID:0/004> FAIL!
<ID:0/004>
<ID:0/004> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

and in download mode
sw. rev check fails device:4 binary 3


i tried already different stock roms but still failed
hope someone can fix my problem :(

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