Guest, Why do you want to change the firmware?
If you are having problems try extracting your firmware, repair it and then reload it. You will find a guide in the Knowledge Base on how to do this.
If you are wanting to add new features etc. upgrading your firmware will not do that it will most likely kill your player.
If your player is dead I suggest you read the
DEAD PLAYER RECOVERY GUIDE
Might need a bit more info on your player to help you find the right firmware. Can you describe your current firmware, Menu images, boot screen etc.