DVDROMs have a controller in much the same way as a Hard drive or a CD-RW. This controller is run by the firmware (a programme or data stored in non-volatile Memory such as EEPROM). Updating the firmaware is done for various reasons. The DVDROM may not be able to read/write 4X DVDRs properly without an upgrade. It's unlikely (though not impossible) that you'll get 4X speed from a firmware update.
A firmware update, if available, will be specifically for your DVDROM and you will have to visit the manufacturer's site to find it.
BTW Please don't write in capitals, it's the same as shouting at people.