18F4520 problem

[seen]

Hello,

I'm trying to adapt the ds30loader for my PIC 18F4520 20MHz ext.


I compiled the firmware 18F with MPLAB 8.92, as the "firmware manual" says.
Then I burned the .HEX.
But when i chek for bl i always get de same message (with reset on the PIC):

Creating port: Prolific USB-to-Serial Comm Port (COM3)
Opening port Prolific USB-to-Serial Comm Port (COM3)@9600
Searching for bl . . . . . . . . . . . . . . . . . . . . . timed out
Closing port

I would appreciate very much if someone could help me?

Thanks.

Enzo