A7N8X rev.2 & Barton2.5+ stuck with 166fsb

Hi! I just upgraded my system and the first thing I tried is to clock my barton2500+ to "10x200fsb" for my 1st o/c step. It just can't do 200fsb, stuck with 166, resulting with '10x166' after a POST when I enter '10x200' in the bios ...any other fsb number higher then 166 is doing 166mhz (even if I try 133fsb, it post with 166!!). Btw, i've the revision 2 with bios #1005. When I try to flash my bios to u1004-final or 1006, I receive the message "Flash ROM is Write-Protected. Please make sure whether lockout jumpers is set to correct or not." So, im stuck with that bios too!


Can someone help, plz, im not very happy with that at all...
TX


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Asus A7N8X Rev. 2.0
AMD Barton 2500+@2gig @12.5x166 with AeroFlow cooling
ATI Rad. 9500Pro @ 315/620
512mb Corsair XMS3200 ddr400
120g Sata West.Digital SE 7200 8mb
30g Ibm Desktar 7200
Onboard 6chan. sound
KDS XFlat 19"
Win XP Pro sp1

voltage?
vdd?
ram?vdimm?