Fresh installation from FireOS via FlashFire >= 0.57 - Click the Red + and choose 'Wipe' - Ensure System data, 3rd party apps and Dalvik cache are CHECKED - Click the Red + button and choose 'Flash ZIP/OTA' - Navigate to and choose the latest Fire Nexus ROM Zip - Accept defaults - Move "Wipe" to the Top of the order - Press the big FLASH button. - Ignore any warnings that appear