First of all, you should not mix burners. It may work, but it may give you intermittant problems.
As far as upgrading the firmware, do the following:
Unzip the firmware so that you have a file with the .bin extention. Your file should have a name like DVD399.bin
Burn a closed session CD/DVD with only that file in the root directory.
Turn on controller and when it finishes booting up press and hold the "mode" button for about 3 to 4 seconds. Until you see "Setup"
Press the mode button a few times untill you get to "Update"
Put the disk you burned into the reader drive.
press the "go" button
thats it. And PLEASE do not turn off power while this is happening!