Default Galaxy S4 strange behaviour after new Bootloader

I tried to upgrade from 4.2.2 to 4.4.2 with omega rom.

I flashed the new modem and bootloader and nox were triggered (Ox1)

so if I want to boot up the 4.4.2 omega rom -> bootloop.

If I try to flash a knox enabled stock rom in odin I get errors like this

<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9505XXUBMGA_I9505OXABMH2_I9505XXUBMGA_HOME.tar.md 5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/006> Odin v.3 engine (ID:6)..
<ID:0/006> File analysis..
<ID:0/006> SetupConnection..
<ID:0/006> Initialzation..
<ID:0/006> Get PIT for mapping..
<ID:0/006> Firmware update start..
<ID:0/006> sbl2.mbn
<ID:0/006> NAND Write Start!!
<ID:0/006> sbl3.mbn
<ID:0/006> rpm.mbn
<ID:0/006> aboot.mbn
<ID:0/006>
<ID:0/006> Complete(Write) operation failed

tried it with flashing the following roms:

I9505XXUEMKE_I9505OXAEMKE_I9505XXUEMKE_HOME.tar
I9505XXUBMGA_I9505OXABMH2_I9505XXUBMGA_HOME.tar

and some other :/

strange thing is my handy ends up with an error "error occured please restore in kiss bla bla ...." I can fix this with flashing another modem ... and can get 4.22 running with no wifi from nandrod. I also can use a 4.4.2 google edition firmware .... but i want a stock rom ... isnt it possible to flash somehow ???