what he means is: when you flash your bios via cd or floppy:
step 1: load into bios, reset defaults, save & exit... computer reboots (this will set your hard drive from raid mode to ide mode)
step 2: load back into bios, set primary boot to cd/floppy, insert cd/floppy, save&exit, reboots into the bios flash
step 2 alternative method: while computer loads, press your setup key (mine is esc), this brings you to your boot menu screen, insert your cd/floppy and choose the coressponding boot device, press enter and it boots into the bios flash
step 3: bios is flashed and your reboot computer, remove cd/floppy after it is rebooted
step 4: load into bios, enable raid mode, change boot order so it boots off your raid, save and exit, reboots
step 4 is important cause then your raids will be re-enabled and you'll be able to boot normally; after all of this, you can reboot back into bios and change any settings that you may have lost when you reset defaults in step 1 (like overclocks and etc)
whenever you flash your bios, its always important to reset your bios settings to default before flashing (step 1) to a new version, if you do not and have overclocked/underclocked your bios before the flash then you may have system issues after the flash
PS I found all of the above info out just recently, week ago or so... cause I was wondering the same thing as you lol. Wanted to know ahead of time cause this tuesday I get my replacement ram back for my system in my rig and Im gonna flash bios before I install windows 7