Underclocked Multiplier for XP T-Breds? Possible?

I'm about to power on an Athlon XP 2200+ hooked up to my Jetway V333DA. Problem is my M/b only has manual jumper settings for upto x12.5 multiplier. The board supports upto 2600+ (266fsb) with a BIOS update...but I'm worried that I wont be able to do that if I can't initially power the 2200+ at an initial x12.5 multiplier.

Can anyone confirm if Athlon XP T-Bred's can be multiplier underclocked?

If the answer is no, can anyone think of a way to update the BIOS in my situation...I've got the floppy ready and waiting......

PR MHz FSB Multiplier Core
1500+ 1333 133 10.0 Palomino
1600+ 1400 133 10.5 Palmoino
1700+ 1467 133 11.0 Palomino/T-Bred
1800+ 1533 133 11.5 Palomino/T-Bred
1900+ 1600 133 12.0 Palomino/T-Bred
2000+ 1667 133 12.5 Palomino/T-Bred
2100+ 1733 133 13.0 Palomino/T-Bred
2200+ 1800 133 13.5 T-Bred
2400+ 2000 133 15.0 T-Bred
2500+ 1833 166 11.0 Barton
2600+ 2133 133 16.0 T-Bred
2600+ 2083 166 12.5 T-Bred
2700+ 2167 166 13.0 T-Bred
2800+ 2250 166 13.5 T-Bred
2800+ 2083 166 12.5 Barton
3000+ 2167 166 13.0 Barton
3200+ 2200 200 11.0 Barton

Cheers for any help!

my 2600+ would show as a 2200 (even 1700+) sometimes when my bios battery was on the blink, but i'm not an authority on such things. i should think (in my educated guess kinda way) that it is possible.