[Q] i9505 downgrade, Odin error topic

Hello everybody !
I REALLY NEED SOME HELP HERE !
I tried to downgrade my S4 i9505 from official 5.0.1 to the official 4.4.2 ..
I tried the same way i did with the 5.0.1 (from 4.4.2 to 5.0.1 )but this time didn t work anymore
Odin says :
<ID:0/005> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9505XXUGNH7_I9505YFGGNI1_I9505XXUGNH7_HOME.tar.md 5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/005> Odin v.3 engine (ID:5)..
<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)
PLEASE HELP
If u had this problem and solve it, please help me buddies !! :((((