Why does Odin keep failing?

[kyzer99]

Odin keeps failing. Please help

I'm using a gt-i9500 s4. My phone is using the kitkat OS. My phone was rooted and now I would like it to be unroot. I've followed some tutorial in the net and it was very helpful. But unfortunately, Odin won't let me pass and I've realize it keeps failing at the same place. I'm replacing my current firmware with a stock firmware. I don't know much about phones and firmware so please try to make this ***** me understand. This is what Odin manage to do;

<ID:0/010> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> G360HDDU0ANL3_G360HOLB0ANL1_G360HDXU0ANL4_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/010> Odin v.3 engine (ID:10)..
<ID:0/010> File analysis..
<ID:0/010> SetupConnection..
<ID:0/010> Initialzation..
<ID:0/010> Get PIT for mapping..
<ID:0/010> Firmware update start..
<ID:0/010> boot.img
<ID:0/010> NAND Write Start!!
<ID:0/010> recovery.img
<ID:0/010> system.img
<ID:0/010> SPRDCP.img
<ID:0/010> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)


It always stop during SPRDCP.img.

Please help.