My SM G950F shows binary 12,but i cant find any b12 filesHello! sw rev. check fail(bootloader) device 8 binary 6 means that the ROM you have downloaded has a binary 6 while the device has a binary 8. In Android, or at least Samsung phones you cannot go to a lower binary than the one present in your device. Basically the only fix I believe is to download a ROM that has a binary of 8. If you do not know what binary it has I will leave a screenshot showing which number signifies a binary (Only mind the number in the binary, the U is a part of that but you just need to look at the number when you're downloading the correct ROM).