Today I tried to flash a popular 4.4.2 google edition firmware here from xda when I gon stuck at bootscreen.
after this I flashe through odin a stock pre-rooted 4.3 firmware that worked. With this I made a twrp backup and instead tried to flash the omega 21.1 useing his installation procedure. (installing knox bootloader etc.) This however didnt work either, stuck at bootscreen.
Then I tried a "restore from brick" procedure that involved formating which was unsuccessful. Then I tried different things out of desperation and now I cant install stock firmware thorugh odin (fail) Even with re-partition and a stock pit (with the stock pre-rooted rom) A original stock file is downloading now (eta 3h). Cant use the backup.
I can however install twrp and the 4.4.2 bootloader.
In "odin-mode" it says:
current binary custom
system status custom
knox karnel 0X0
knox void 0X1
write protection enabled.
emmc burst mode enabled