Now, months later, I am flashing the UK firmware. However, even though I do a thorough wipe (data/cache/dalvik), and post-flash I confirm the build number as N9005XXUENB7 as the UK version, it still defaults to Polish language on first boot.
How can I get this to reset back to UK for proper? Is it because the bootloader was upgraded to 4.4.x by the Polish firmware? Would it be safe for me to tick "Phone Bootloader Update" and reflash the UK firmware again?
Knox has already been tripped, not bothered about that.