Default Flasing problem: bootloader stays on Serial??

i need some help here...

i finally have fond a Generik NL Rom
but it wont flash

i have done everything from back up my old vodafone one to hard SPL

but when i put de Kovsimg.nbh on my to fat32 converted micro SD
and open the bootloader it gives de tri-colour screen and says:

in the red: Kovs110
spl-0.72.OliNex
MicroP1-787
MicroP2-707

and in the white is goes direct to ''Serial''

do any one know how to fix it?