fsusb-0.1.11 problem

I am now trying to get PIC FS USB demo board working under Linux and
I have been playing with the Linux usb bootloader fsusb-0.1.11 from 
http://internetking.org/fsusb/.

I even want to port it to Windows using libusb-win32 (still not
successful yet).

However I just find out out that it is actually not working on my
Ubuntu box. What could be the problem? usb_pickit is working for
PICkit 1.

Regards,
Xiaofan


mcuee@ubuntu:~/Desktop/build/fsusb-0.1.11$ sudo ./fsusb MCHPUSB.hex
Locating USB Microchip(tm) PICDEM-FS USB(tm) (vendor 0x04d8/product 0x000b)
Found USB PICDEM-FS USB as device '005' on USB bus 002
Communication established.  Onboard firmware version is 1.0
Writing program memory successful
mismatch in 32-byte chunk at 0x00000000:
File:  beef0cf01200####################################################
Device:e3ef03f01200ffff04ef04f01200ffffffffffffffffffff0cef04f01200ffff
Program memory contains errors!