this Hybrid OS works with digicel's BIS instead of the crappy OS v4.7.0.075.
1. u need to instal the OS v5.0.0.451 to PC (this can be downloaded from www.blackberryforums.com).. i really have no clue if the original release works but this hybrid does.
2. visit the link below and follow the instructions:
http://www.bbhybrids.net/downloads.php?do=file&id=1084
Easy!
I'm using it on my BB 9530 right now and even the EDGE speed seems to perform a bit faster and places where signal was normally poor - seems to work alot better.