Yes indeed i'm having a G900F device and If I be clear, can I use the following method to install your new ODEX rom?
1) Go to recovery and make "wipe data" and "wipe cache"
2) Go to download mod and flash by Odin stock firmware G900FXXU1ANE2
3) Install Towelroot and tick "make it ra1n"
4) Install form google play store Mobile Odin Pro
5) Run Mobile Odin Pro and follow these steps:
-select rom in "OTA / Update ZIP"
-untick "Enable EverRoot"
-choose "After flash" and select "Download Mode"
-tick "Flash firmware"
6) Go to download mod and flash by Odin bootloader BOB7 (position BL) and modem BOB7 (position CP)
Specially the section in RED is it possible with the zip file which is given to be downloaded by you.
But i cant see no reason to work using Mobile Odin