Just be careful when flashing any bios for any device. There is usually no going back if things go pear shaped. This especially applies to updating DVD/CD-roms as if you enter the wrong details into the flash program you could flash the wrong one.
If you know what you are doing it should be ok though
I upgraded the firmware of my cdrw and it made the thing worse instead of better > recording quality stayed the same but it hardly ever reads any disc except the ones burned with it...fortunately the other "normal" cd-rom drive has no problems reading.
So my advice: be careful...personally I wouldn't use new firmware or a new bios if I didn't need it.