5.4 Firmware will not flash...

I've just tried to update the firmware to 5.4, and it freezes on Finalizing FLASH programming. I've tested the flash app on vista and XP.
Have also tried to use an older version to get it working again and it just comes up with Programming Error during the Finalizing stage...
EDIT: It seems 5.9 is the latest? I've just tried latestfirmware.zip and get the same programming error
Can anyone help?
James
Have also tried to use an older version to get it working again and it just comes up with Programming Error during the Finalizing stage...
EDIT: It seems 5.9 is the latest? I've just tried latestfirmware.zip and get the same programming error
Can anyone help?
James