need help i bricked my galaxy s5 g900a

so i downloaded the 4.4.2 firmware i did all the steps with odin.. and i keep getting this



<OSM> Please wait..
<OSM> G900A_Downgrade_to_NCE.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/003> Odin engine v(ID:3.1005)..
<ID:0/003> File analysis..
<ID:0/003> SetupConnection..
<ID:0/003> Initialzation..
<ID:0/003> Set PIT file..
<ID:0/003> DO NOT TURN OFF TARGET!!
<ID:0/003> Get PIT for mapping..
<ID:0/003> Firmware update start..
<ID:0/003> SingleDownload.
<ID:0/003> boot.img
<ID:0/003> NAND Write Start!!
<ID:0/003> recovery.img
<ID:0/003> persist.img.ext4
<ID:0/003> system.img.ext4
<ID:0/003> FAIL! (Auth)
<ID:0/003>
<ID:0/003> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

IF ANYONE CAN TELL ME WHAT IM DOING WRONG THAT WOULD BE GREAT... THANKS