It worked for me as mentioned by another to do a battery pull right at the first restart.Have anybody fixed this cabsender error: "system.exception: firmware device is null"? I still can't upload language pack. What I'm doing wrong?
I've just unlock my Titan as described ht tp://ww w.youtube.com/watch?v=drTVTuj71TY
You run the cab sender
It prepares the update
It restart the phone **NOW you do a battery pull
Power it on and hold down only 'Vol Down' to boot into the Zune Connect Screen
The Cabsender will continue and update the titan.