Downgrade HH firmware

Does anyone have the firmware updater or know where I can get it?
I believe it is on the BT installation CD but I don't seem to be able to find mine.

I would like to downgrade the firmware on my HomeHub to 6.1.1.R as I would like to use the DMT tool again.

Thanks

Chris

Firmware 6.1.1.R was never released to the public only as an automatic update. The one before that was 6.1.1.M which was released as a HTTP download. I have it on my webspace but I have tried to roll it back and it doesn't work.