si en la mia tambien se puede hacer asi pero lei que es poco recomendable.. al final lo hice por una USB y todo salio bien! si lo haces hacelo por una USB mejor.. mas seguro
Recovery BIOS Update [SO4598P.BIO] - A .BIO file to be used for BIOS recovery process, regardless of operating system. In the unlikely event that a BIOS update is interrupted, it is possible the BIOS may be left in an unusable state. Use the Recovery BIOS update to recovering from this condition. It requires a blank floppy diskette or CD.
ISO Image BIOS Update [SO4598P.ISO] - Bootable ISO image BIOS update; this is the recommended method to update the BIOS on systems running Linux*. It requires a blank CD and a read/writeable CD drive.
Iflash BIOS Update / Integrator Toolkit BIOS Files [SOX5810J.86A.4598.BI.ZIP] - A DOS-based utility to update the BIOS regardless of operating system. It requires a CD or a USB flash device. This download also provides the necessary files for Intel® Integrator Toolkit. Support and FAQs for Intel® Integrator Toolkit are available here.
Express BIOS Update [SOX5810J.86A.4598.EB.EXE] - Self-extracting Windows*-based update file includes Software License Agreement and the utility for updating the BIOS. It is designed to be used on Windows* systems. This method is the most commonly used.
Fijate que estan estos, cual es el de USB? Y por cierto siempre e usado el .EXE y nunca me dio problema, aunque ahi mismo dice "This method is the most commonly used" asi que tienes razon...