You need the adecuate service books and to follow the procedure described here:
bb .anworm .com/ (remove spaces)
or here:
www . howardforums.com / showthread.php?t=1530734 (remove spaces)

or google search for "Blackberry without BIS"

is not easy to find the files you need, but if you invest some time on it you will have it working.

H.