Galaxy S5- Need Help Installing Stock Firmware

hi
i installed karnal to original rom (G900FXXU1POEC_G900FOJV1POF1_XSG firmware installed in phone) and now 2 problem:
1- err karnal and stop at logo Samsung
2- can p can't install any Rom with odin evry time message err screen of G900F : secure check fail g900f
and odin:
<ID:0/003> Added!!
<OSM> Enter CS for MD5..
<OSM> Binary Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/003> Odin engine v(ID:3.1100)..
<ID:0/003> File analysis..
<ID:0/003> SetupConnection..
<ID:0/003> Initialzation..
<ID:0/003> Get PIT for mapping..
<ID:0/003> Firmware update start..
<ID:0/003> SingleDownload.
<ID:0/003> aboot.mbn
<ID:0/003> NAND Write Start!!
<ID:0/003> FAIL! (Auth)
<ID:0/003>
<ID:0/003> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)
<ID:0/003> Removed!

please help to solve