Dear community,

i'm trying to change my S7 (SM930FD) from SaudiArabian rom to a more european, the russian ROM.
mostly to get the ramadan block out of the calendar, because i'm not a muslim.

therefore i already downloaded the russian ROM for my phone.
i picked not the latest, but the one from 08/2018

in Odin i received the message "Fail" and on my phones display, it says:
"sw rev. check fail (bootloader) device 4 binary 2"

My Question is: what do i have to consider to flash a different regional stock ROM with an earlier version (but still Oreo 8.0.0), than the currently installed?

Thank you in advance