CF Boot Hangs After FBA

Hello,

I'm trying to boot a windows xp embedded image from an usb compact flash
card. I think I'm following all correct steps, but it seems something is
wrong:

I'm using an EPIA MS board with an CF-USB bridge embedded. I can boot DOS
from the CF withouy any problem.

I'm using a removable CF with one partition. I've fdisk it, format /mbr and
bootprep.

I've ran TAP.EXE from WinPe and get a correct hardware list. Target
Designer adds all needed USB components. I set usbehci, usbohci, usbhub and
usbstor to be loaded at phase 0 and LoadGroup to "Boot Bus Extender" in all
of them. I'll generate the xpe image without errors.
In addition I manually set this settings at inf files under window/inf
directory: usb.inf, usbport.inf and usbstor.inf.

I copy final image to CF and boots. System boots correctly and FBA start
working reporting no error. When it finished, system restarts and after
ntloader ends I get the famous 7B error. (If I don't make modifications to
USB components at TD, FBA never runs, because 7B error arrives first).

Any idea?

Thank you very much

Regards

Rob