You need to be on 905 with all stock files in place to pass the system checks that the OTA will go through. If you're on 232 you need to go back to 905 if you want the OTA. If you're on 905 but rooted, rooting alone usually won't block the update. If you rooted and moved around or deleted some system files, the update will notice that and probably not work.
Also, I haven't checked thoroughly, but I don't see any Android news sites mentioning this text/announcement that OP got....